Update ChangeLog and version files for release

ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

config/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-22  H.J. Lu  <hjl.tools@gmail.com>
 
 	Backported from master:

contrib/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-08  Alexandre Oliva  <oliva@adacore.com>
 
 	Backported from master:

contrib/header-tools/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

contrib/reghunt/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

contrib/regression/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

fixincludes/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/BASE-VER

-10.1.1
+10.2.0

gcc/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-21  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.h (TARGET_AVOID_MFENCE):

gcc/ada/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-23  Eric Botcazou  <ebotcazou@gcc.gnu.org>
 
 	* gcc-interface/trans.c (gnat_to_gnu) <N_Allocator>: Minor tweaks.

gcc/analyzer/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/brig/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/c-family/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-29  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from master:

gcc/c/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-13  Julian Brown  <julian@codesourcery.com>
 
 	Backported from master:

gcc/cp/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-15  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR target/95726

gcc/d/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-28  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	Backported from master:

gcc/fortran/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-13  Julian Brown  <julian@codesourcery.com>
 
 	Backported from master:

gcc/go/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/jit/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/lto/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/objc/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/objcp/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gcc/po/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-20  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.pot: Regenerate.

gcc/testsuite/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-16  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>
 
 	Backported from master:

gnattools/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

gotools/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

include/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-13  Julian Brown  <julian@codesourcery.com>
 
 	Backported from master:

intl/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libada/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libatomic/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libbacktrace/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-08  Ian Lance Taylor  <iant@golang.org>
 
 	* configure.ac: Test linker support for DWARF5

libcc1/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libcpp/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libcpp/po/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-15  Joseph Myers  <joseph@codesourcery.com>
 
 	* sv.po: Update.

libdecnumber/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libffi/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgcc/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-13  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	Backported from master:

libgcc/config/avr/libf7/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgcc/config/libbid/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgfortran/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-29  Jakub Jelinek  <jakub@redhat.com>
 
 	PR libfortran/95390

libgomp/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-14  Kwok Cheung Yeung  <kcy@codesourcery.com>
 
 	Backported from master:

libhsail-rt/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libiberty/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-22  H.J. Lu  <hjl.tools@gmail.com>
 
 	Backported from master:

libitm/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-13  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	Backported from master:

libobjc/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

liboffloadmic/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libphobos/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-17  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/95166

libquadmath/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libsanitizer/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libssp/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libstdc++-v3/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-07-09  Jonathan Wakely  <jwakely@redhat.com>
 
 	Backported from master:

libvtv/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

lto-plugin/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-06-22  H.J. Lu  <hjl.tools@gmail.com>
 
 	Backported from master:

maintainer-scripts/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

zlib/ChangeLog

+2020-07-23  Release Manager
+
+	* GCC 10.2.0 released.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.