[PATCH] D80003: [clang][clang-scan-deps] Add a mode that can compute overhead in duplicated module builds

[Daniel Grumberg via Phabricator via cfe-commits]

dang created this revision.
dang added a reviewer: Bigcheese.
Herald added subscribers: cfe-commits, tschuett, dexonsmith.
Herald added a project: clang.

Adds a command line option "--metrics" that computes and outputs this
information at the end of a run.
This identifies modules duplicated due to strict context hashing and computes
how many of them of identical ASTs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80003

Files:
  clang/include/clang/Frontend/CompilerInvocation.h
  clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
  clang/tools/clang-scan-deps/ClangScanDeps.cpp

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