Jon Roelofs d143103068 [GlobalOpt] Fix a miscompile when evaluating struct initializers. ...

The bug was that evaluateBitcastFromPtr attempts a narrowing to a struct's 0th
element of a store that covers other elements. While this is okay on the load
side, applying it to stores causes us to miss the writes to the additionally
covered elements.

rdar://79503568

Differential revision: https://reviews.llvm.org/D105838

2021-07-14 15:37:01 -07:00

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