[PATCH] Make an RAII initializer for COM on Windows

[Zachary Turner]

In http://reviews.llvm.org/D9267#161494, @majnemer wrote:

> Might be nice to have 'RAII' in the class name.


Do we do that for any other types of these classes?  For example, there's `llvm_shutdown_obj`, `scoped_ptr`?  I don't feel too strongly either way, but if this is a desirable naming convention then we shoudl think about formalizing it.


http://reviews.llvm.org/D9267

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