Index: lib/ProfileData/InstrProf.cpp
===================================================================
--- lib/ProfileData/InstrProf.cpp
+++ lib/ProfileData/InstrProf.cpp
@@ -89,9 +89,9 @@
     // that it will stay the same, e.g., if the files are checked out from
     // version control in different locations.
     if (FileName.empty())
-      FuncName = FuncName.insert(0, "<unknown>:");
+      FuncName = FuncName.insert(0, "_unknown_");
     else
-      FuncName = FuncName.insert(0, FileName.str() + ":");
+      FuncName = FuncName.insert(0, FileName.str() + "_");
   }
   return FuncName;
 }