Switch the std::multimap shadow map used in code completion to an
llvm::DenseMap, for a 20% performance improvement in the
Cocoa-big-list performance benchmark.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90715 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed