Make MBBMap a DenseMap instead of a std::map.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55220 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index fb4de57..ebac0fe 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -145,7 +145,7 @@
 FastISel::SelectInstructions(BasicBlock::iterator Begin,
                              BasicBlock::iterator End,
                              DenseMap<const Value*, unsigned> &ValueMap,
-                             std::map<const BasicBlock*,
+                             DenseMap<const BasicBlock*,
                                       MachineBasicBlock *> &MBBMap,
                              MachineBasicBlock *mbb) {
   MBB = mbb;