labath added a comment.

Well, if a type is trivially copyable (which DWARFDebugInfo **should** be, 
though I haven't checked), it should be able to do the copy via a single 
`memcpy` instead of a bunch of constructor calls. That should be more-or-less 
equivalent to realloc.

If this does not end up being implented as a memcpy here, we have an easy 
opportunity to improve things.


Repository:
  rL LLVM

https://reviews.llvm.org/D47492



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