re PR c++/79301 (With -Werror=pedantic outside C++17 mode, __has_cpp_attribute(fallthrough) is nonzero but [[fallthrough]] fails)

	PR c++/79301
	* parser.c (cp_parser_std_attribute): Don't pedwarn about
	[[deprecated]] with -std=c++11 and [[fallthrough]] with
	-std=c++11 and -std=c++14.

	* g++.dg/cpp1y/feat-cxx11-neg.C: Remove (with pedwarn) from
	[[deprecated]] comment.
	* g++.dg/cpp1y/feat-cxx98-neg.C: Likewise.
	* g++.dg/cpp1y/feat-cxx11.C: Likewise.
	* g++.dg/cpp1y/attr-deprecated-neg.C: Don't expect warnings for
	[[deprecated]] in -std=c++11.
	* g++.dg/cpp0x/fallthrough2.C: Don't expect warnings for
	[[fallthrough]] in -std=c++11 and -std=c++14.

From-SVN: r245489