* target.h (struct gcc_target): Add hard_regno_scratch_ok field.

	* target.h (struct gcc_target): Add hard_regno_scratch_ok field.
	* target-def.h (TARGET_HARD_REGNO_SCRATCH_OK): New.
	(TARGET_INITIALIZER): Use TARGET_HARD_REGNO_SCRATCH_OK.
	* targhooks.c (default_hard_regno_scratch_ok): New function.
	* targhooks.h (default_hard_regno_scratch_ok): Declare function.
	* doc/tm.texi: Document TARGET_HARD_REGNO_SCRATCH_OK hook.
	* recog.c:  Include "target.h".
	(peep2_find_free_register): Add check for global regs. Add target
	specific check.
	* Makefile.in (recog.o): Depend on target.h.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@137657 138bc75d-0d04-0410-961f-82ee72b054a4