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[NFC][ValueTracking] Add OffsetZero into findAllocaForValue

Authored by vitalybuka on Aug 27 2020, 1:45 PM.

Description

[NFC][ValueTracking] Add OffsetZero into findAllocaForValue

For StackLifetime after finding alloca we need to check that
values ponting to the begining of alloca.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D86692

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