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

[Diego Novillo]

Hi bogner,

As discussed in
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20141027/242445.html,
the creation of reader and writer instances is better done using
ErrorOr. There are no functional changes, but several callers needed to
be adjusted.

http://reviews.llvm.org/D6076

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