gcc/

gcc/
	* combine.c (propagate_for_debug): Call make_compound_operation
	on the source value.
	(try_combine): When implementing a split chosen by find_split_point,
	either copy i2src or set it to null.  Assert that i2src is not null
	before substituting into CALL_INSN_FUNCTION_USAGE.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159600 138bc75d-0d04-0410-961f-82ee72b054a4