[PATCH] Enable FastISel on ARM for Linux and NaCl

[JF Bastien]

FastISel was only enabled for iOS ARM and Thumb2, this patch enables it for
ARM (not Thumb2) on Linux and NaCl.

Thumb2 support needs a bit more work, mainly around register class
restrictions.

The patch punts to SelectionDAG when doing TLS relocation on non-Darwin
targets. I will fix this and other FastISel-to-SelectionDAG failures in a
separate patch.

The patch also forces FastISel to retain frame pointers: iOS always keeps
them for backtracking (so emitted code won't change because of this), but
Linux was getting much worse code that was incorrect when using big frames
(such as test-suite's lencod). I'll also fix this in a later patch, it will
probably require a peephole so that FastISel doesn't rematerialize frame
pointers back-to-back.

The test changes are straightforward, similar to:

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130513/174279.html
They all add a vararg test that got dropped in that change.

I ran all of test-suite on A15 hardware with --optimize-option=-O0 and all
the tests pass.
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