AArch64/ARM64: run AArch64 NEON MC tests through ARM64 too.

This skips a couple of compare ones due to the different syntaxt for
floating-point 0.0. AArch64 does it more canonically, and we'll need to fiddle
ARM64 to make it work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207119 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64/ARM64: add ARM64 runs to more MC tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207120 91177308-0d34-0410-b5e6-96231b3b80d8