[PATCH] D20082: [ProfileData] Use SoftInstrProfErrors to count soft errors

[Vedant Kumar via llvm-commits]

vsk created this revision.
vsk added a reviewer: davidxl.
vsk added subscribers: lhames, llvm-commits.

This helper class will make the transition to Error/Expected easier.

The immediate benefit is that it keeps track of the number of soft errors encountered, which can help during debugging. The future benefit is that `SoftInstrProfErrors` can be made undroppable by adding a simple destructor: this lets us handle soft errors properly with a significantly reduced malloc overhead.

Another benefit is that it lets us delete some error-tracking code in the main "merge" and "scale" logic.

http://reviews.llvm.org/D20082

Files:
  include/llvm/ProfileData/InstrProf.h
  lib/ProfileData/InstrProf.cpp
  lib/ProfileData/InstrProfWriter.cpp

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