Vedant Kumar 338daec4d5 Revert "[llvm-profdata] Speed up merging by using a thread pool"
This reverts commit r275921. It broke the ppc64be bot:

  http://lab.llvm.org:8011/builders/clang-ppc64be-linux-multistage/builds/3537

I'm not sure why it broke, but based on the output, it looks like an
off-by-one (one profile left un-merged).

llvm-svn: 275937
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