[PATCH] Fix ARM FastISel tests, as a first step to enabling ARM FastISel

[JF Bastien]

ARM FastISel is currently only enabled for iOS non-Thumb1, and I'm working
on enabling it for other targets. As a first step I've fixed some of the
tests.

Changes to ARM FastISel tests:
- Different triples don't generate the same relocations (especially
movw/movt versus constant pool loads). Use a regex to allow either.
- Mangling is different. Use a regex to allow either.
- The reserved registers are sometimes different, so registers get
allocated in a different order. Capture the names only where this occurs.
- Add -verify-machineinstrs to some tests where it works. It doesn't work
everywhere it should yet.
- Add -fast-isel-abort to many tests that didn't have it before.
- Split out the VarArg test from fast-isel-call.ll into its own test. This
simplifies test setup because of --check-prefix.

I'm mostly done with code changes to enable ARM FastISel and will upload
separate patches for this. I still have an issue outstanding with lencod,
which I'm lead to understand might be tricky.
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