Merge DenseMapKeyInfo & DenseMapValueInfo into DenseMapInfo

Add a new DenseMapInfo::isEqual method to allow clients to redefine
the equality predicate used when probing the hash table.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42042 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocBigBlock.cpp b/lib/CodeGen/RegAllocBigBlock.cpp
index c7f23f5..7f402a6 100644
--- a/lib/CodeGen/RegAllocBigBlock.cpp
+++ b/lib/CodeGen/RegAllocBigBlock.cpp
@@ -63,6 +63,7 @@
   struct VRegKeyInfo {
     static inline unsigned getEmptyKey() { return -1U; }
     static inline unsigned getTombstoneKey() { return -2U; }
+    static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
     static unsigned getHashValue(const unsigned &Key) { return Key; }
   };