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Reland r356547 after fixing the tests for Linux.

Authored by zinovy.nis on Mar 20 2019, 8:50 AM.

Description

Reland r356547 after fixing the tests for Linux.

[clang-tidy] Parallelize clang-tidy-diff.py

This patch has 2 rationales:

  • large patches lead to long command lines and often cause max command line length restrictions imposed by OS;
  • clang-tidy runs on modified files are independent and can be done in parallel, the same as done for run-clang-tidy.

Differential Revision: https://reviews.llvm.org/D57662

llvm-svn: 356565