Use lower16 / upper16 imm modifiers to asmprint 32-bit imms splitted via movt/movw pair.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83572 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index bdaae22..1679e12 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -329,13 +329,14 @@
   }
   case MachineOperand::MO_Immediate: {
     int64_t Imm = MO.getImm();
+    O << '#';
     if (Modifier) {
       if (strcmp(Modifier, "lo16") == 0)
-        Imm = Imm & 0xffffLL;
+        O << ":lower16:";
       else if (strcmp(Modifier, "hi16") == 0)
-        Imm = (Imm & 0xffff0000LL) >> 16;
+        O << ":upper16:";
     }
-    O << '#' << Imm;
+    O << Imm;
     break;
   }
   case MachineOperand::MO_MachineBasicBlock: