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78c0b35bf7
Rewrite `ConstantUniqueMap` to be more similar to
`ConstantAggrUniqueMap`.
- Use a `DenseMap` with custom MapInfo instead of a `std::map` with
linear lookups and deletion.
- Don't waste memory explicitly storing (heavyweight) keys.
Only `ConstantExpr` and `InlineAsm` actually use this data structure, so
I also updated them to use it.
This code cleanup is a precursor to reducing RAUW traffic on
`ConstantExpr` -- I felt badly adding a new (linear) call to
`ConstantUniqueMap::FindExistingKey`, so this designs away the concern.
A follow-up commit will transition the users of `ConstantAggrUniqueMap`
over.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215957 91177308-0d34-0410-b5e6-96231b3b80d8
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