Artur Pilipenko 345f01481b NFC. Introduce Value::getPointerDerferecnceableBytes ...

Extract a part of isDereferenceableAndAlignedPointer functionality to Value::getPointerDerferecnceableBytes. Currently it's a NFC, but in future I'm going to accumulate all the logic about value dereferenceability in this function similarly to Value::getPointerAlignment function (D16144).

Reviewed By: reames

Differential Revision: http://reviews.llvm.org/D17572

llvm-svn: 267708

2016-04-27 12:51:01 +00:00

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