2012-04-13  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/52939
	* gimple-fold.c (gimple_get_virt_method_for_binfo): Bail out if
	fold_ctor_reference returns a zero constant.

	* testsuite/g++.dg/ipa/pr52939.C: New test.

From-SVN: r186428