Don't hardcode the %reg format in the streamer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132451 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index fc2aa75..8ae87f8 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -29,8 +29,8 @@
   return getInstructionName(Opcode);
 }
 
-StringRef ARMInstPrinter::getRegName(unsigned RegNo) const {
-  return getRegisterName(RegNo);
+void ARMInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
+  OS << getRegisterName(RegNo);
 }
 
 void ARMInstPrinter::printInst(const MCInst *MI, raw_ostream &O) {