[PATCH] Add getValueOr to llvm::Optional<T>.

[Jordan Rose]

Hi dblaikie,

This takes a single argument convertible to T, and
- if the Optional has a value, returns the existing value,
- otherwise, constructs a T from the argument and returns that.

Inspired by std::experimental::optional from the "Library Fundamentals" C++ TS.

http://reviews.llvm.org/D5507

Files:
  include/llvm/ADT/Optional.h
  unittests/ADT/OptionalTest.cpp
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