Improve diagnostics if _Noreturn is placed after a function declarator. (This sometimes happens when a macro is used that expands to either the GNU noreturn attribute or _Noreturn.)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221630 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: set all processor features from -arch if nothing else present

Darwin's "-arch arm64" option implies full Cyclone CPU, for both architectural
and tuning purposes. So if neither of the explicit options have been given,
forward that on to the proper invocation.

rdar://problem/18906227

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@221631 91177308-0d34-0410-b5e6-96231b3b80d8