Fix a constant lowering bug. Now we can do load and store instructions with funky getelementptr embedded in the address operand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55975 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/FastISel.h

@@ -80,6 +80,11 @@ public:
   /// be assigned the value for the given LLVM value.
   unsigned getRegForValue(Value *V);
 
+  /// lookUpRegForValue - Look up the value to see if its value is already
+  /// cached in a register. It may be defined by instructions across blocks or
+  /// defined locally.
+  unsigned lookUpRegForValue(Value *V);
+
   virtual ~FastISel();
 
 protected: