Eli Friedman c11e2b9470 [ARM] Handle all-ones mask explicitly in targetShrinkDemandedConstant. ...

This avoids a potential infinite loop setting and unsetting bits in the
mask.

Reduced from a failure on the polly-aosp bot.

Differential Revision: https://reviews.llvm.org/D51066

llvm-svn: 340446

2018-08-22 20:13:45 +00:00

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