PR rtl-optimization/63637

	PR rtl-optimization/63637
	PR rtl-optimization/60663
	* cse.c (merge_equiv_classes): Set new_elt->cost to MAX_COST
	if elt->cost is MAX_COST for ASM_OPERANDS.
	(find_sets_in_insn): Fix up comment typo.
	(cse_insn): Don't set src_volatile for all non-volatile
	ASM_OPERANDS in PARALLELs, but just those with multiple outputs
	or with "memory" clobber.  Set elt->cost to MAX_COST
	for ASM_OPERANDS in PARALLEL.  Set src_elt->cost to MAX_COST
	if new_src is ASM_OPERANDS and elt->cost is MAX_COST.

	* gcc.dg/pr63637-1.c: New test.
	* gcc.dg/pr63637-2.c: New test.
	* gcc.dg/pr63637-3.c: New test.
	* gcc.dg/pr63637-4.c: New test.
	* gcc.dg/pr63637-5.c: New test.
	* gcc.dg/pr63637-6.c: New test.
	* gcc.target/i386/pr63637-1.c: New test.
	* gcc.target/i386/pr63637-2.c: New test.
	* gcc.target/i386/pr63637-3.c: New test.
	* gcc.target/i386/pr63637-4.c: New test.
	* gcc.target/i386/pr63637-5.c: New test.
	* gcc.target/i386/pr63637-6.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@220059 138bc75d-0d04-0410-961f-82ee72b054a4