[GlobalDCE] Use DenseMap instead of unordered_multimap for GVDependencies.
Summary:
std::unordered_multimap happens to be very slow when the number of elements
grows large. On one of our internal applications we observed a 17x compile time
improvement from changing it to DenseMap.
Reviewers: mehdi_amini, serge-sans-paille, davide
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D38916
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316045
91177308-0d34-0410-b5e6-
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