* tree-pass.h (make_pass_ipa_comdats): New pass.
	* timevar.def (TV_IPA_COMDATS): New timevar.
	* passes.def (pass_ipa_comdats): Add.
	* Makefile.in (OBJS): Add ipa-comdats.o
	* ipa-comdats.c: New file.

	* g++.dg/ipa/comdat.C: New file.

From-SVN: r210597