Comment tweak requested in code review. NFC

I forgot to do this before committing D54755.

llvm-svn: 347918
diff --git a/llvm/lib/IR/DebugInfoMetadata.cpp b/llvm/lib/IR/DebugInfoMetadata.cpp
index be98577..3b702ce 100644
--- a/llvm/lib/IR/DebugInfoMetadata.cpp
+++ b/llvm/lib/IR/DebugInfoMetadata.cpp
@@ -551,7 +551,8 @@
 
 StringRef DISubprogram::getFlagString(DISPFlags Flag) {
   switch (Flag) {
-  case SPFlagVirtuality: // Appease a warning.
+  // Appease a warning.
+  case SPFlagVirtuality:
     return "";
 #define HANDLE_DISP_FLAG(ID, NAME)                                             \
   case SPFlag##NAME:                                                           \