[PATCH] D141230: [clang-format-diff.py] give clang-format-diff a job pool (10x speed)

[Sean Maher via Phabricator via cfe-commits]

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This patch changes the implementation of clang-format-diff.py to 
start up many clang-format processes in parallel in order to speed
up clang-format-diff.py by several orders of magnitude on large
patches (less than a minute instead of several tens of minutes).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141230

Files:
  clang/tools/clang-format/clang-format-diff.py

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