* alias.c: Include ipa-utils.h.
	(get_alias_set): Try to complete ODR type via ODR type hash lookup.
	* ipa-devirt.c (prevailing_odr_type): New.
	* ipa-utils.h (previaling_odr_type): Declare.

	* g++.dg/lto/alias-1_0.C: New testcase.
	* g++.dg/lto/alias-1_1.C: New testcase.

From-SVN: r271837