[PATCH] D148150: [InstrProf][Temporal] Add weight field to traces

[Ellis Hoag via Phabricator via llvm-commits]

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As discussed in [0], add a `weight` field to temporal profiling traces found in profiles. This allows users to use the `--temporal-profile-trace-weight` flag in the `llvm-profdata merge` command to weight traces from different scenarios differently.

Note that this is a breaking change, but since [1] landed very recently and there is no way to "use" this trace data, there should be no users of this feature. We believe it is acceptable to land this change without bumping the profile format version.

[0] https://reviews.llvm.org/D147812#4259507
[1] https://reviews.llvm.org/D147287


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148150

Files:
  compiler-rt/test/profile/instrprof-timestamp.c
  llvm/docs/CommandGuide/llvm-profdata.rst
  llvm/include/llvm/ProfileData/InstrProf.h
  llvm/include/llvm/ProfileData/InstrProfReader.h
  llvm/lib/ProfileData/InstrProfReader.cpp
  llvm/lib/ProfileData/InstrProfWriter.cpp
  llvm/test/tools/llvm-profdata/merge-traces.proftext
  llvm/test/tools/llvm-profdata/read-traces.proftext
  llvm/test/tools/llvm-profdata/trace-limit.proftext
  llvm/tools/llvm-profdata/llvm-profdata.cpp
  llvm/unittests/ProfileData/InstrProfTest.cpp

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