separate the tracing code in other function, call the tracing code only
if trace active.

This makes the code somewhat easier to read and somewhat more efficient



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14038 a5019735-40e9-0310-863c-91ae7b9d1cf9
Fix some obsolete comments, now that we have an ht of parsed abbvs


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14039 a5019735-40e9-0310-863c-91ae7b9d1cf9