decl.c (grokdeclarator): constexpr only implies const in C++11.

decl.c (grokdeclarator): constexpr only implies const in C++11.

2014-10-09  Marc Glisse  <marc.glisse@inria.fr>

gcc/cp/
	* decl.c (grokdeclarator): constexpr only implies const in C++11.
gcc/testsuite/
	* g++.dg/cpp0x/constexpr-52892-1.C: Error on missing const in C++14.
	* g++.dg/cpp0x/constexpr-array-ptr7.C: Likewise.
	* g++.dg/cpp0x/constexpr-diag1.C: Add const.
	* g++.dg/cpp0x/constexpr-diag3.C: Likewise.
	* g++.dg/cpp0x/constexpr-ex1.C: Likewise.
	* g++.dg/cpp0x/constexpr-ex2.C: Likewise.
	* g++.dg/cpp0x/constexpr-ex4.C: Likewise.
	* g++.dg/cpp0x/constexpr-initlist.C: Likewise.
	* g++.dg/cpp0x/constexpr-ptrmem.C: Likewise.
	* g++.dg/cpp0x/constexpr-ptrsub.C: Likewise.
	* g++.dg/cpp0x/constexpr-ref4.C: Likewise.
	* g++.dg/cpp0x/constexpr-static6.C: Likewise.

From-SVN: r216039