[Patch] [ARM] Fix bug in tryFoldSPUpdateIntoPushPop

[Weiming Zhao]

Hi,

 

This patch fixes the issue in http://llvm.org/bugs/show_bug.cgi?id=19136

There might be two ways to do it: One is to fix tryFoldSPUpdateIntoPushPop()
to let it check livness of subregs.

The other ways is to fix MBB->computeRegisterLiveness().

 

The patch uses the first way.

 

Please help to review.

 

Thanks,

Weiming

 

 

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