[llvm] r232743 - GlobalDCE: Improve performance for large modules containing comdats.

[Chandler Carruth]

On Thu, Mar 19, 2015 at 11:23 AM, Peter Collingbourne <peter at pcc.me.uk>
wrote:

> +    std::unordered_multimap<Comdat *, GlobalValue *> ComdatMembers;


I wonder if a DenseMap<Comdat *, TinyPtrVector<GlobalValue *>> would be
better? (Using a sorted vector and std::binary_search naturally.) In
particular, it seems like it might make sense to optimize for the case of a
1:1 correlation between comdat and global.
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