[PATCH] D15306: [llvm-profdata] Add support for weighted merge of profile data (2nd try)

[Nathan Slingerland via llvm-commits]

slingn created this revision.
slingn added a reviewer: davidxl.
slingn added a subscriber: llvm-commits.

This change adds support for an optional weight when merging profile data with the llvm-profdata tool.
Weights are specified by adding an option ':<weight>' suffix to the input file names.

Adding support for arbitrary weighting of input profile data allows for relative importance to be placed on the
input data from multiple training runs.

Both sampled and instrumented profiles are supported.

http://reviews.llvm.org/D15306

Files:
  docs/CommandGuide/llvm-profdata.rst
  include/llvm/ProfileData/InstrProf.h
  include/llvm/ProfileData/InstrProfWriter.h
  include/llvm/ProfileData/SampleProf.h
  lib/ProfileData/InstrProfWriter.cpp
  test/tools/llvm-profdata/Inputs/weight-instr-bar.profdata
  test/tools/llvm-profdata/Inputs/weight-instr-foo.profdata
  test/tools/llvm-profdata/Inputs/weight-sample-bar.proftext
  test/tools/llvm-profdata/Inputs/weight-sample-foo.proftext
  test/tools/llvm-profdata/weight-instr.test
  test/tools/llvm-profdata/weight-sample.test
  tools/llvm-profdata/llvm-profdata.cpp
  unittests/ProfileData/InstrProfTest.cpp

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