[PATCH] D144981: [Driver] Allow to collect `-save-stats` data to a file specified in the environment variable.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai created this revision.
vsapsai added reviewers: MatzeB, ahatanak.
Herald added a subscriber: ributzka.
Herald added a project: All.
vsapsai requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay.
Herald added a project: clang.

Using two environment variables `CC_PRINT_INTERNAL_STAT` and
`CC_PRINT_INTERNAL_STAT_FILE` to work like `CC_PRINT_PROC_STAT`.

The purpose of the change is to allow collecting the internal stats
without modifying the build scripts. Write all stats to a single file
to simplify aggregating the data.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144981

Files:
  clang/docs/CommandGuide/clang.rst
  clang/include/clang/Driver/Driver.h
  clang/lib/Driver/Driver.cpp
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/lib/Frontend/CompilerInstance.cpp
  clang/test/Driver/save-stats.c
  clang/tools/driver/driver.cpp

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