Added FoldingSet style 'profiling' support for APInt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46188 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/APInt.h

@@ -24,6 +24,7 @@
 namespace llvm {
   class Serializer;
   class Deserializer;
+  class FoldingSetNodeID;
   
   /* An unsigned host type used as a single part of a multi-part
      bignum.  */
@@ -210,6 +211,10 @@ public:
   ///  for object deserialization (pair this with the static method Read).
   explicit APInt() : BitWidth(1) {}
   
+  /// Profile - Used to insert APInt objects, or objects that contain APInt 
+  ///  objects, into FoldingSets.
+  void Profile(FoldingSetNodeID& ID) const;
+  
   /// @brief Used by the Bitcode serializer to emit APInts to Bitcode.
   void Emit(Serializer& S) const;