[ARC] Check the assembler for gdwar2 support.

gcc/
2017-09-18  Claudiu Zissulescu  <claziss@synopsys.com>

	* configure.ac: Add arc and check if assembler supports gdwar2.
	* configure: Regenerate.

From-SVN: r252927

gcc/ChangeLog

+2017-09-18  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* configure.ac: Add arc and check if assembler supports gdwarf2.
+	* configure: Regenerate.
+
 2017-09-18  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/82220

gcc/configure

@@ -27664,9 +27664,9 @@ esac
 # ??? Once 2.11 is released, probably need to add first known working
 # version to the per-target configury.
 case "$cpu_type" in
-  aarch64 | alpha | arm | avr | bfin | cris | i386 | m32c | m68k | microblaze \
-  | mips | nios2 | pa | riscv | rs6000 | score | sparc | spu | tilegx \
-  | tilepro | visium | xstormy16 | xtensa)
+  aarch64 | alpha | arc | arm | avr | bfin | cris | i386 | m32c | m68k \
+  | microblaze | mips | nios2 | pa | riscv | rs6000 | score | sparc | spu \
+  | tilegx | tilepro | visium | xstormy16 | xtensa)
     insn="nop"
     ;;
   ia64 | s390)

gcc/configure.ac

@@ -4810,9 +4810,9 @@ esac
 # ??? Once 2.11 is released, probably need to add first known working
 # version to the per-target configury.
 case "$cpu_type" in
-  aarch64 | alpha | arm | avr | bfin | cris | i386 | m32c | m68k | microblaze \
-  | mips | nios2 | pa | riscv | rs6000 | score | sparc | spu | tilegx \
-  | tilepro | visium | xstormy16 | xtensa)
+  aarch64 | alpha | arc | arm | avr | bfin | cris | i386 | m32c | m68k \
+  | microblaze | mips | nios2 | pa | riscv | rs6000 | score | sparc | spu \
+  | tilegx | tilepro | visium | xstormy16 | xtensa)
     insn="nop"
     ;;
   ia64 | s390)