[X86] Remove part of an if condition that should always be true.

The IndexReg will always be non-null at this point. Earlier in the function, if
IndexReg was null we set it to CurDAG->getRegister(0, VT) which made it
non-null.

llvm-svn: 359170

llvm/lib/Target/X86/X86ISelDAGToDAG.cpp

@@ -2293,7 +2293,7 @@ bool X86DAGToDAGISel::selectLEAAddr(SDValue N,
       Complexity += 2;
   }
 
-  if (AM.Disp && (AM.Base_Reg.getNode() || AM.IndexReg.getNode()))
+  if (AM.Disp)
     Complexity++;
 
   // If it isn't worth using an LEA, reject it.