reload.c (find_reloads_toplev): Use simplify_gen_subreg.

gcc:
	* reload.c (find_reloads_toplev): Use simplify_gen_subreg.
	* simplify-rtx.c (simplify_subreg): When converting to a non-int
	mode, try to convert to an integer mode of matching size first.

gcc/testsuite:
	* gcc.c-torture/compile/simd-4.c: New test.

From-SVN: r55687