Jianzhou Zhao efc8f3311b [msan] Set cmpxchg shadow precisely ...

In terms of https://llvm.org/docs/LangRef.html#cmpxchg-instruction,
the return type of chmpxchg is a pair {ty, i1}, while I think we
only wanted to set the shadow for the address 0th op, and it has type
ty.

Reviewed-by: eugenis

Differential Revision: https://reviews.llvm.org/D97029

2021-02-19 20:23:23 +00:00

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