* combine.c (try_combine): Handle the case that undobuf.other_insn

	* combine.c (try_combine): Handle the case that undobuf.other_insn
	has been turned into a return or unconditional jump, by inserting
	a BARRIER if necessary.
	(simplify_set):  Test if a condition code setter has a constant
	comparison at compile time, if so convert this insn to a no-op move
	and update/simplify the condition code user (undobuf.other_insn).

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56955 138bc75d-0d04-0410-961f-82ee72b054a4