[llvm] r183966 - Enable FastISel on ARM for Linux and NaCl, not MCJIT

[JF Bastien]

> I think you're right. For some reason it doesn't show on the bot's list of
> commits, not sure why, but this is the only one in between the two builds
> that could have caused it.
>

Which is the better fix? ARM FastISel (and therefore O0) now has disable
frame pointer elimination on by default, so the DW_AT_APPLE_omit_frame_ptr
debug information shouldn't be present in either test case.

At the same time I assume that once the bug I filed is resolved (emit
correct and performant code) the test will go back to its previous state.
Also, AFAICT Darwin has the same issue (it always has FP on FastISel), but
because it doesn't go through this flag the test "passes". Presumably the
debugger knows that and doesn't need the debug info?

So: XFAIL, or change the test?
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