David Blaikie a28eda7e40 Allow llvm::Optional to work with types without default constructors.
This generalizes Optional to require less from the T type by using aligned
storage for backing & placement new/deleting the T into it when necessary.

Also includes unit tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175580 91177308-0d34-0410-b5e6-96231b3b80d8
2013-02-20 00:26:04 +00:00
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