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[libFuzzer] Unpoison parameters before calling user callback.

Authored by morehouse on May 9 2019, 3:48 PM.

Description

[libFuzzer] Unpoison parameters before calling user callback.

Summary:
Fixes an MSan false positive when compiling with
-fsanitize=memory,fuzzer.

See https://github.com/google/oss-fuzz/issues/2369 for more details.

Reviewers: kcc

Reviewed By: kcc

Subscribers: llvm-commits, metzman, eugenis

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61753

llvm-svn: 360390