[PATCH] D133153: [support] Prepare TimeProfiler for cross-thread support

[Mark Shields via Phabricator via llvm-commits]

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This NFC sets up the TimeProfiler for support the construction
and completion of time profiling 'entries' across threads.
(See https://reviews.llvm.org/D133083).

- Add ClockType alias so we can change the clock in one place.
- (trivial) Use c++ usings instead of typedefs
- Rename Entry to TimeTraceProfilerEntry since this type will eventually become public.
- Move construction of entries from TimeTraceProfiler::begin to timeTraceProfilerBegin.
- Add an intro comment.
- Generalize from raw_pwrite_stream to raw_ostream to support unit tests (and raw_pwrite_stream::pwrite was unused anyway).
- Add some smoke unit tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133153

Files:
  llvm/include/llvm/Support/TimeProfiler.h
  llvm/lib/Support/TimeProfiler.cpp
  llvm/unittests/Support/CMakeLists.txt
  llvm/unittests/Support/TimeProfilerTest.cpp

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