Rebased PNaCl localmods in LLVM to 223109

include/llvm/CodeGen/MachineConstantPool.h

Index: include/llvm/CodeGen/MachineConstantPool.h
diff --git a/include/llvm/CodeGen/MachineConstantPool.h b/include/llvm/CodeGen/MachineConstantPool.h
index c619afb83333a83f5ae031ce346dcbef0970db0d..20fb181b5c5cc0d075bd421fdba3993b8f8fb342 100644
--- a/include/llvm/CodeGen/MachineConstantPool.h
+++ b/include/llvm/CodeGen/MachineConstantPool.h
@@ -58,6 +58,17 @@ public:
 
   virtual void addSelectionDAGCSEId(FoldingSetNodeID &ID) = 0;
 
+  // @LOCALMOD-START
+  /// getJumpTableIndex - Check if this is a reference to a jump table.
+  /// If so, return a pointer to the jump table index value that is stored
+  /// in the constant pool, else return 0.
+  /// The default behavior is to indicate that the value is not a jump table
+  /// index. This is used by BranchFolder::runOnMachineFunction() and only in
+  /// conjunction with ARM targets
+  /// TODO: this should be cleaned up as it does tripple duty: tester, setter, getter
+  virtual unsigned *getJumpTableIndex() { return 0; }
+  // @LOCALMOD-END
+
   /// print - Implement operator<<
   virtual void print(raw_ostream &O) const = 0;
 };