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[libFuzzer] Fix MSan false positives with custom mutators.

Authored by morehouse on Tue, Apr 13, 9:25 AM.

Description

[libFuzzer] Fix MSan false positives with custom mutators.

We need to unpoison parameters before calling into MSan-instrumented
user-defined mutators.

Addresses https://github.com/google/oss-fuzz/issues/4605.

Reviewed By: metzman

Differential Revision: https://reviews.llvm.org/D100355

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