Vedant Kumar 9240c457f7 [llvm-cov] Use a thread pool to speed up report generation (NFC)
It's safe to print out source coverage views using multiple threads when
using the -output-dir mode of the `llvm-cov show` sub-command.

While testing this on my development machine, I observed that the speed
up is roughly linear with the number of available cores. Avg. time for
`llvm-cov show ./llvm-as -show-line-counts-or-regions`:

    1 thread: 7.79s user 0.33s system 98% cpu 8.228 total
    4 threads: 7.82s user 0.34s system 283% cpu 2.880 total

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275321 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-13 21:38:36 +00:00
..
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