[PATCH] D16727: [Profiling] Write out sparse indexed profiles

[Vedant Kumar via llvm-commits]

vsk created this revision.
vsk added reviewers: davidxl, slingn.
vsk added a subscriber: llvm-commits.

Instead of writing out InstrProfRecords which contain only 0 counts, skip them.

The Xcode team asked for this so that the (often sparse) profiles gathered from UI tests take up less space.

http://reviews.llvm.org/D16727

Files:
  include/llvm/ProfileData/InstrProfWriter.h
  lib/ProfileData/InstrProfWriter.cpp
  test/tools/llvm-profdata/general.proftext
  test/tools/llvm-profdata/weight-instr.test
  tools/llvm-profdata/llvm-profdata.cpp
  unittests/ProfileData/CoverageMappingTest.cpp
  unittests/ProfileData/InstrProfTest.cpp

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