PATCH] allocateCopy() util for BumpPtrAllocator

[Nick Kledzik]

It is easy to use BumPtrAllocator with placement-new to allocate and initialize a C++ object, but it is harder to allocate and copy other types with BumpPtrAllocator, such as StringRef.  I did not see any helper utils to do that, so I wrote this patch.  I added a few variations of allocateCopy() which each make allocating and copying different types easier.


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