[PATCH] D94439: [ADT][NFC] Use empty base optimisation in BumpPtrAllocatorImpl

[Nathan James via Phabricator via llvm-commits]

njames93 added a comment.

In D94439#2491075 <https://reviews.llvm.org/D94439#2491075>, @dblaikie wrote:

> I think for full generality the standard library does some things to check if a type can be derived from before using it in this way - but we probably don't need all that machinery for LLVM-internal allocator stuff like this?

We just have to make sure people don't use an allocator that's defined with the final keyword. I doubt we are going to run into many cases of that. 
I have done the template magic to get it make it work if someone wants to use an allocator marked final, should I include it?


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