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[FuzzerUtil] Partially revert D38481 on FuzzerUtil

Authored by timshen on Oct 3 2017, 6:05 PM.

Description

[FuzzerUtil] Partially revert D38481 on FuzzerUtil

This is because lib/Fuzzer doesn't really depend on llvm infrastucture.
It's not easy to access the llvm hardware_concurrency here.

Differential Reivision: https://reviews.llvm.org/D38481

llvm-svn: 314870