[XCore] Use getSignedConstant()

Author: nikic

llvm/lib/Target/XCore/XCoreISelLowering.cpp

@@ -282,7 +282,8 @@ LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const
     GA = getGlobalAddressWrapper(GA, GV, DAG);
     // Handle the rest of the offset.
     if (Offset != FoldedOffset) {
-      SDValue Remaining = DAG.getConstant(Offset - FoldedOffset, DL, MVT::i32);
+      SDValue Remaining =
+          DAG.getSignedConstant(Offset - FoldedOffset, DL, MVT::i32);
       GA = DAG.getNode(ISD::ADD, DL, MVT::i32, GA, Remaining);
     }
     return GA;