re PR middle-end/48661 (wrong-code regression with devirtualization)

re PR middle-end/48661 (wrong-code regression with devirtualization)

	PR middle-end/48661
	* gimple-fold.c (gimple_get_virt_method_for_binfo): Return NULL
	if TREE_TYPE (v) is non-NULL.

	* gimple-fold.c (gimple_get_virt_method_for_binfo): Renamed from
	gimple_get_virt_mehtod_for_binfo.
	* gimple.h (gimple_get_virt_method_for_binfo): Likewise.
	* ipa-cp.c (ipcp_process_devirtualization_opportunities): Adjust
	callers.
	* ipa-prop.c (try_make_edge_direct_virtual_call): Likewise.

	* g++.dg/torture/pr48661.C: New test.

From-SVN: r172677