Make commenting on close namespace brackets consistent.

Ran all the source files through 'perl -pi' with this script:

s|\s*(};?\s*)?/\*\s*(end\s*)?namespace\s*(\S+)\s*\*/(\s*})?|} // namespace $3|;
s|\s*};?\s*//\s*(end\s*)?namespace\s*(\S+)\s*|} // namespace $2\n|;
s|\s*};?\s*//\s*(\S+)\s*namespace\s*|} // namespace $1\n|;

Also did a little manual editing on some of the arch/*/isa_traits.hh files
and src/SConscript.

src/SConscript

@@ -835,7 +835,7 @@ extern const int numFlagStrings;
 // base flags to set.  Inidividual flag arrays are terminated by -1.
 extern const Flags *compoundFlags[];
 
-/* namespace Trace */ }
+} // namespace Trace
 
 #endif // __BASE_TRACE_FLAGS_HH__
 ''')
@@ -902,7 +902,7 @@ EmbeddedPython embedded_${sym}(
     ${{len(data)}},
     ${{len(marshalled)}});
 
-/* namespace */ }
+} // anonymous namespace
 ''')
     code.write(str(target[0]))