Fix for PR ipa/63569.

	PR ipa/63569
	* gcc.dg/ipa/pr63569.c: New test.
	PR ipa/63569
	* ipa-icf-gimple.c (func_checker::compare_operand): Add missing
	comparison for volatile flag.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218949 138bc75d-0d04-0410-961f-82ee72b054a4