* Makefile.in (gcse.o): Now includes ggc.h.

	* Makefile.in (gcse.o): Now includes ggc.h.
	* gcse.c: Include ggc.h.
	(want_to_gcse_p): Verify expression can be in SET as valid insn.
	(try_replace_reg): Remove warning of uninitialize variable.
	(process_insert_insn): Call invalid_insn_p to validate insn.
	* recog.c (insn_invalid_p): Now global.
	See if can make valid by adding CLOBBERs of SCRATCH only and do if so.
	* recog.h (insn_invalid_p): New declaration.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@39857 138bc75d-0d04-0410-961f-82ee72b054a4