PR c++/56915
	* semantics.c (maybe_add_lambda_conv_op): Give up if the call op
	isn't defined.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199231 138bc75d-0d04-0410-961f-82ee72b054a4
	PR c++/56930
	* call.c (convert_like_real): Use cp_convert_and_check.
	* cvt.c (cp_convert_and_check): Use maybe_constant_value.
	* semantics.c (cxx_eval_constant_expression): Handle LTGT_EXPR.
	(potential_constant_expression_1): Handle OMP_ATOMIC*.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199232 138bc75d-0d04-0410-961f-82ee72b054a4