[PATCH] D130944: [llvm-profdata] Add --json

[Kazu Hirata via Phabricator via llvm-commits]

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This patch teaches llvm-profdata to output the sample profile in the
JSON format.  The new option is intended to be used for research and
development purposes.  For example, one can write a Python script to
take a JSON file and analyze how similar different inline instances of
a given function are to each other.

I've chosen JSON because Python can parse it reasonably fast, and it
just takes a couple of lines to read the whole data:

  import json
  profile = json.load(open('profile.json'))


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130944

Files:
  llvm/include/llvm/ProfileData/SampleProf.h
  llvm/include/llvm/ProfileData/SampleProfWriter.h
  llvm/lib/ProfileData/SampleProfWriter.cpp
  llvm/test/tools/llvm-profdata/sample-profile-json.test
  llvm/tools/llvm-profdata/llvm-profdata.cpp

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