Rafael Espindola 2da970364f Convert a few methods to use ErrorOr.
It used to be inconvenient to mix ErrorOr and UniquePtr, but with c++11
they work OK together.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211532 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-23 20:41:02 +00:00
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