PLD, PLDW, PLI encodings, plus refactor their use of addrmode2.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117571 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index 892558e..21b3e1c 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -613,8 +613,11 @@
   O << "[" << getRegisterName(MO1.getReg());
 
   int32_t OffImm = (int32_t)MO2.getImm();
-  // Don't print +0.
-  if (OffImm < 0)
+  bool isSub = OffImm < 0;
+  // Special value for #-0. All others are normal.
+  if (OffImm == INT32_MIN)
+    OffImm = 0;
+  if (isSub)
     O << ", #-" << -OffImm;
   else if (OffImm > 0)
     O << ", #" << OffImm;