[PATCH] D22438: [llvm-profdata] Speed up merging by using a thread pool

[Vedant Kumar via llvm-commits]

vsk marked an inline comment as done.
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In https://reviews.llvm.org/D22438#487497, @davidxl wrote:

> lgtm
>
> Probably also add a test as a follow up to test option -num-threads=1 and some other non-default value.


Thanks. I'll add the test.


https://reviews.llvm.org/D22438