[PATCH] Use ErrorOr for the ::create factory on instrumented and sample profilers.

[Diego Novillo]

Closed by commit rL221120 (authored by @dnovillo).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6076

Files:
  llvm/trunk/include/llvm/ProfileData/InstrProfReader.h
  llvm/trunk/include/llvm/ProfileData/SampleProfReader.h
  llvm/trunk/include/llvm/ProfileData/SampleProfWriter.h
  llvm/trunk/lib/ProfileData/InstrProfReader.cpp
  llvm/trunk/lib/ProfileData/SampleProfReader.cpp
  llvm/trunk/lib/ProfileData/SampleProfWriter.cpp
  llvm/trunk/lib/Transforms/Scalar/SampleProfile.cpp
  llvm/trunk/tools/llvm-profdata/llvm-profdata.cpp
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