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
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267708 91177308-0d34-0410-b5e6-96231b3b80d8