[all-commits] [llvm/llvm-project] a91a00: Reland "[gn build] (manually) port 36892727e4f1"

[Nico Weber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a91a00d378aa00952aca0e75e1f936b7182d9810
      https://github.com/llvm/llvm-project/commit/a91a00d378aa00952aca0e75e1f936b7182d9810
  Author: Nico Weber <thakis at chromium.org>
  Date:   2022-02-01 (Tue, 01 Feb 2022)

  Changed paths:
    M llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn

  Log Message:
  -----------
  Reland "[gn build] (manually) port 36892727e4f1"

This reverts commit da01fb7471a027c29db1b78e1721cd1ae6df6572.
Matches 84f137a590e7.

Also adds LLVM_INSTALL_TOOLCHAIN_ONLY, which 84f137a590e7 added too.