AArch64/ARM64: update Clang after AArch64 removal.

A few (mostly CodeGen) parts of Clang were tightly coupled to the
AArch64 backend. Now that it's gone, they will not even compile.

I've also deduplicated RUN lines in many of the AArch64 tests. This
might improve "make check-all" time noticably: some of those NEON
tests were monsters.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@209578 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64/ARM64: rename ARM64 components to AArch64

This keeps Clang consistent with backend naming conventions.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@209579 91177308-0d34-0410-b5e6-96231b3b80d8