re PR ipa/87957 (ICE tree check: expected tree that contains ‘decl minimal’ structure, have ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051 since r265519)

	PR ipa/87957
	* ipa-devirt.c (warn_odr): Look for main variant to get TYPE_DECL.

From-SVN: r266235