gcc/
	* cgraph.c (cgraph_add_to_same_comdat_group): New.
	* cgraph.h: Declare it.
	* ipa.c (function_and_variable_visibility): Make sure thunks
	have the right visibility.
gcc/cp/
	* method.c (use_thunk): Use cgraph_add_to_same_comdat_group.
	* optimize.c (maybe_clone_body): Likewise.
	* semantics.c (maybe_add_lambda_conv_op): Likewise.

From-SVN: r176071