[PR 66616] Check for thunks when adding extra constants to clones

2015-12-14  Martin Jambor  <mjambor@suse.cz>

	PR ipa/66616
	* ipa-cp.c (propagate_constants_accross_call): Move thuk check...
	(call_passes_through_thunk_p): ...here.
	(find_more_scalar_values_for_callers_subset): Perform thunk checks
	like propagate_constants_accross_call does.

testsuite/
	* g++.dg/ipa/pr66616.C: New test.

From-SVN: r231607