Fix a bug in my previous checkin

llvm-svn: 23082
diff --git a/llvm/lib/Target/X86/X86ISelPattern.cpp b/llvm/lib/Target/X86/X86ISelPattern.cpp
index 9f60241..a874404 100644
--- a/llvm/lib/Target/X86/X86ISelPattern.cpp
+++ b/llvm/lib/Target/X86/X86ISelPattern.cpp
@@ -3374,7 +3374,7 @@
         assert(cast<VTSDNode>(Node->getOperand(3))->getVT() == MVT::f32 &&
                "Bad EXTLOAD!");
         unsigned CPIdx = BB->getParent()->getConstantPool()->
-          getConstantPoolIndex(cast<ConstantPoolSDNode>(N)->get());
+          getConstantPoolIndex(CP->get());
 
         addConstantPoolReference(BuildMI(BB, X86::FLD32m, 4, Result), CPIdx);
         return Result;