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When we encounter a global with a comdat, rather than iterating over every global in the module to find globals in the same comdat, store the members in a multimap. This effectively lowers the complexity to O(N log N), improving performance significantly for large modules such as might be encountered during LTO. It looks like we used to do something like this until r219191. No functional change. Differential Revision: http://reviews.llvm.org/D8431 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232743 91177308-0d34-0410-b5e6-96231b3b80d8
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