re PR c++/77914 (Wrong lambda definition accepted)

re PR c++/77914 (Wrong lambda definition accepted)

	PR c++/77914
	* parser.c (cp_parser_lambda_declarator_opt): Pedwarn with
	OPT_Wpedantic on lambda templates for -std=c++14 and higher.

	* g++.dg/cpp1y/lambda-generic-77914.C: New test.
	* g++.dg/cpp1y/lambda-generic-dep.C: Add -pedantic to dg-options,
	expect a warning.
	* g++.dg/cpp1y/lambda-generic-x.C: Add -Wpedantic to dg-options,
	expect warnings.
	* g++.dg/cpp1y/lambda-generic-mixed.C: Add empty dg-options.
	* g++.dg/cpp1y/pr59636.C: Likewise.
	* g++.dg/cpp1y/pr60190.C: Likewise.

From-SVN: r244907