revert: extend.texi (PowerPC Built-in Functions): Rename this subsection.

2018-05-08  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	Revert:
	* doc/extend.texi (PowerPC Built-in Functions): Rename this
	subsection.
	(Basic PowerPC Built-in Functions): The new name of the
	subsection previously known as "PowerPC Built-in Functions".
	(Basic PowerPC Built-in Functions Available on all Configurations):
	New subsubsection.
	(Basic PowerPC Built-in Functions Available on ISA 2.05): New
	subsubsection.
	(Basic PowerPC Built-in Functions Available on ISA 2.06): New
	subsubsection.
	(Basic PowerPC Built-in Functions Available on ISA 2.07): New
	subsubsection.
	(Basic PowerPC Built-in Functions Available on ISA 3.0): New
	subsubsection.

From-SVN: r260065

gcc/ChangeLog

+2018-05-08  Kelvin Nilsen  <kelvin@gcc.gnu.org>
+
+	Revert:
+	* doc/extend.texi (PowerPC Built-in Functions): Rename this
+	subsection.
+	(Basic PowerPC Built-in Functions): The new name of the
+	subsection previously known as "PowerPC Built-in Functions".
+	(Basic PowerPC Built-in Functions Available on all Configurations):
+	New subsubsection.
+	(Basic PowerPC Built-in Functions Available on ISA 2.05): New
+	subsubsection.
+	(Basic PowerPC Built-in Functions Available on ISA 2.06): New
+	subsubsection.
+	(Basic PowerPC Built-in Functions Available on ISA 2.07): New
+	subsubsection.
+	(Basic PowerPC Built-in Functions Available on ISA 3.0): New
+	subsubsection.
+
 2018-05-08  Jim Wilson  <jimw@sifive.com>
 
 	* config/riscv/linux.h (MUSL_ABI_SUFFIX): Delete unnecessary backslash.