This patch updates setup_incoming_promotions in combine.c to match what
is actually passed in assign_parm_setup_reg in function.c.

gcc/

	PR rtl-optimization/64037
	* combine.c (setup_incoming_promotions): Pass the argument
	before any promotions happen to promote_function_mode.

gcc/testsuite/

	PR rtl-optimization/64037
	* g++.dg/pr64037.C: New test.

From-SVN: r218720