asm3.C (two): Only use register keyword for C++14 and earlier.

	* g++.dg/ext/asm3.C (two): Only use register keyword for C++14 and
	earlier.
	* g++.dg/charset/asm2.c (memmove): Likewise.
	* g++.dg/tls/diag-2.C (foo): Expect -Wregister error for C++17.
	* g++.dg/tls/diag-4.C (foo): Likewise.
	* c-c++-common/vector-subscript-2.c (vf): Change dg-error to
	dg-warning, fix up regex.
	* g++.old-deja/g++.brendan/warnings4.C: Limit to c++14_down targets.
	* g++.old-deja/g++.mike/p700.C: Add -Wno-register.
	* g++.old-deja/g++.mike/net31.C: Likewise.
	* g++.old-deja/g++.other/regstack.C (foo): Expect -Wregister warning
	for C++17.
	* g++.old-deja/g++.jason/enum3.C: Add -Wno-register.
	* g++.old-deja/g++.eh/ia64-1.C: Likewise.

From-SVN: r240702