[Fuzzer] Assign names to workers

Allow to have a name for workers in case the fuzzed code is itself using threads.

Reviewers: vitalybuka

Reviewed-By: vitalybuka

Differential Revision: https://reviews.llvm.org/D155754

GitOrigin-RevId: b2a253855f4e9e8335fd674c42b9ad675eb562c5
7 files changed