[PATCH] GlobalDCE: Improve performance for large modules containing comdats.

[Rafael Ávila de Espíndola]

LGTM with a suggestion.


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Comment at: lib/Transforms/IPO/GlobalDCE.cpp:50
@@ -49,2 +49,3 @@
     SmallPtrSet<Constant *, 8> SeenConstants;
+    std::multimap<Comdat *, GlobalValue *> ComdatMembers;
 
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Would unordered_multimap be any better?

http://reviews.llvm.org/D8431

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