[PATCH] D68252: [Stats] Add ALWAYS_ENABLED_STATISTIC enabled regardless of LLVM_ENABLE_STATS.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai created this revision.
vsapsai added reviewers: dsanders, bogner, rtereshin.
Herald added subscribers: ributzka, dexonsmith, jkorous, hiraditya.
Herald added a project: LLVM.

The intended usage is to measure relatively expensive operations. So the
cost of the statistic is negligible compared to the cost of a measured
operation and can be enabled all the time without impairing the
compilation time.

The change in clang is an example of where ALWAYS_ENABLED_STATISTIC can be
used. I'm also planning to add more stats for header search and modules.

rdar://problem/55715134


https://reviews.llvm.org/D68252

Files:
  clang/include/clang/Basic/FileManager.h
  clang/include/clang/Lex/HeaderSearch.h
  clang/lib/Basic/FileManager.cpp
  clang/lib/Lex/HeaderSearch.cpp
  llvm/include/llvm/ADT/Statistic.h
  llvm/lib/Support/Statistic.cpp
  llvm/unittests/ADT/StatisticTest.cpp

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