re PR rtl-optimization/13060 ([g77] ICE in fixup_var_refs_1, at function.c:1947 on correct code with "-O2 -fno-force-mem")

	PR optimization/13060
	* function.c (fixup_var_refs_1) [SUBREG]: Recognize even if a
	replacement already exists.  Fix again the whole insn if that fails.

From-SVN: r74386