Followup on Proposal to move MIR physical register namespace to '$' sigil.

Discussed here:

http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html

In preparation for adding support for named vregs we are changing the sigil for
physical registers in MIR to '$' from '%'. This will prevent name clashes of
named physical register with named vregs.

llvm-svn: 323922
diff --git a/llvm/unittests/CodeGen/MachineOperandTest.cpp b/llvm/unittests/CodeGen/MachineOperandTest.cpp
index cedea8c..53ec5ae 100644
--- a/llvm/unittests/CodeGen/MachineOperandTest.cpp
+++ b/llvm/unittests/CodeGen/MachineOperandTest.cpp
@@ -80,7 +80,7 @@
   std::string str;
   raw_string_ostream OS(str);
   MO.print(OS, /*TRI=*/nullptr, /*IntrinsicInfo=*/nullptr);
-  ASSERT_TRUE(OS.str() == "%physreg1.subreg5");
+  ASSERT_TRUE(OS.str() == "$physreg1.subreg5");
 }
 
 TEST(MachineOperandTest, PrintCImm) {