Profiler: Move ELF object name to its own profile graph column

This way you don't have to look at all the library names if you don't
want to. Since we're pretty good about namespacing our things, the
library names are slightly redundant information.

Userland/DevTools/Profiler/ProfileModel.h

@@ -40,6 +40,7 @@ public:
     enum Column {
         SampleCount,
         SelfCount,
+        ObjectName,
         StackFrame,
         __Count
     };