Have you found such a tool and used it successfully?
I wrote a flash profiler based on flasm a while ago (http://snow.prohosting.com/bensch/flasp.html) You need to use flasm to insert the profiling asm and then run the program.
Another (maybe) better way is to use David Chang's profiling code which doesn't require flasm at all. www.nochump.com/asprof/
cheers