re PR target/89399 (ICE: RTL check: expected code 'set', 'clobber' or 'clobber_high', have 'parallel' in combine_reaching_defs, at ree.c:783)

	PR rtl-optimization/89399
	* ree.c (combine_set_extension): Use single_set rather than
	digging into PATTERN for items on the candidate list.
	(combine_reaching_defs): Likewise.

	PR rtl-optimization/89399
	* gcc.c-torture/compile/pr89399.c: New test.

From-SVN: r270151