testsuite: Fix ending of comment in test cases

gcc/testsuite/ChangeLog:

	* gcc.dg/pr108757-1.c: Fixed dg-comment.
	* gcc.dg/pr71071.c: Likewise.
	* gcc.dg/tree-ssa/noreturn-1.c: Likewise.
	* gcc.dg/tree-ssa/pr56727.c: Likewise.
	* gcc.target/arc/loop-2.cpp: Likewise.
	* gcc.target/arc/loop-3.c: Likewise.
	* gcc.target/arc/pr9001107555.c: Likewise.
	* gcc.target/arm/armv8_1m-fp16-move-1.c: Likewise.
	* gcc.target/arm/armv8_1m-fp32-move-1.c: Likewise.
	* gcc.target/arm/armv8_1m-fp64-move-1.c: Likewise.
	* gcc.target/i386/amxint8-asmatt-1.c: Likewise.
	* gcc.target/i386/amxint8-asmintel-1.c: Likewise.
	* gcc.target/i386/avx512bw-vpermt2w-1.c: Likewise.
	* gcc.target/i386/avx512vbmi-vpermt2b-1.c: Likewise.
	* gcc.target/i386/endbr_immediate.c: Likewise.
	* gcc.target/i386/pr96539.c: Likewise.
	* gcc.target/i386/sse2-pr98461-2.c: Likewise.
	* gcc.target/m68k/pr39726.c: Likewise.
	* gcc.target/m68k/pr52076-1.c: Likewise.
	* gcc.target/m68k/pr52076-2.c: Likewise.
	* gcc.target/nvptx/v2si-vec-set-extract.c: Likewise.

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>