re PR tree-optimization/60899 (undef reference generated with -fdevirtualize-speculat...

re PR tree-optimization/60899 (undef reference generated with -fdevirtualize-speculatively)

	PR tree-optimization/60899
	* gimple-fold.c (can_refer_decl_in_current_unit_p): Cleanup;
	assume all static symbols will have definition wile parsing and
	check the do have definition later in compilation; check that
	variable referring symbol will be output before concluding that
	reference is safe; be conservative for referring local statics;
	be more precise about when comdat is output in other partition.

	g++.dg/ipa/devirt-11.C: Update template.

From-SVN: r210676