ARM use a dedicated printer for postidx_reg operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136968 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index 37359ce..7972b27 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -382,6 +382,15 @@
   O << '#' << ((Imm & 256) ? "" : "-") << (Imm & 0xff);
 }
 
+void ARMInstPrinter::printPostIdxRegOperand(const MCInst *MI, unsigned OpNum,
+                                            raw_ostream &O) {
+  const MCOperand &MO1 = MI->getOperand(OpNum);
+  const MCOperand &MO2 = MI->getOperand(OpNum+1);
+
+  O << getAddrOpcStr(ARM_AM::getAM3Op(MO2.getImm()))
+    << getRegisterName(MO1.getReg());
+}
+
 void ARMInstPrinter::printPostIdxImm8s4Operand(const MCInst *MI,
                                              unsigned OpNum,
                                              raw_ostream &O) {