[PATCH] X86: Enable subregister liveness tracking.

[Quentin Colombet]

Hi Matthias,

Could you add a test case that demonstrates a difference in codegen other than # kill comments?
Something that uses the -enable-subreg-liveness=<bool> switch.

My concern is that if we disable the subreg liveness, we do not have something to tell us.

Thanks,
-Quentin


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http://reviews.llvm.org/D8488

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