Gui Andrade 05e3ab41e4 [MSAN] Avoid dangling ActualFnStart when replacing instruction ...

This would be a problem if the entire instrumented function was a call
to
e.g. memcpy

Use FnPrologueEnd Instruction* instead of ActualFnStart BB*

Differential Revision: https://reviews.llvm.org/D86001

2020-08-14 23:50:38 +00:00

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