George Burgess IV a19ea3454d Clean up uses of unique_ptr for RAII objects. NFC.
- EnterExpressionEvaluationContext allows you to specify whether you
  *actually* want to enter an evaluation context.
- For types that don't allow that, llvm::Optional<Foo> should do the
  same thing as std::unique_ptr<Foo>, but with 100% less heap
  allocations.

llvm-svn: 286500
2016-11-10 20:43:52 +00:00
2016-11-10 20:35:21 +00:00
2016-11-10 09:08:03 +00:00
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