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/GlobalISel/PatternMatchTest.cpp b/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
index 5b55738..dd26e9b 100644
--- a/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
+++ b/llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp
@@ -91,9 +91,9 @@
   - { id: 3, class: _ }
 body: |
   bb.1:
-    %0(s64) = COPY %x0
-    %1(s64) = COPY %x1
-    %2(s64) = COPY %x2
+    %0(s64) = COPY $x0
+    %1(s64) = COPY $x1
+    %2(s64) = COPY $x2
 )MIR") + Twine(MIRFunc) + Twine("...\n"))
                             .toNullTerminatedStringRef(S);
   std::unique_ptr<MIRParser> MIR;