[llvm-commits] PATCH: Split the implementation of DenseMap to allow custom allocation strategies for the buckets array

[Chandler Carruth]

The goal is to have a SmallDenseMap class that shares most of the logic
(and iterators etc) with DenseMap, but allocates a small bucket array
in-line.

There are several smaller refactoring steps that clean things up after this
one, but this is the invasive change I really want pre-commit review on.
The rest should follow easily afterward.
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