[X86] LowerGlobalOrExternal - cleanup SDLoc. NFC.

Don't create a new local SDLoc and then take a reference to it, just create the SDLoc directly.

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -18559,7 +18559,7 @@ X86TargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
 SDValue X86TargetLowering::LowerGlobalOrExternal(SDValue Op, SelectionDAG &DAG,
                                                  bool ForCall) const {
   // Unpack the global address or external symbol.
-  const SDLoc &dl = SDLoc(Op);
+  SDLoc dl(Op);
   const GlobalValue *GV = nullptr;
   int64_t Offset = 0;
   const char *ExternalSym = nullptr;