doesn't work quite well when symbols are not loaded -- e.g. stack crawls
are usually broken. Also stack crawls ending in a syscall work. gdb can
deal well enough with frameless function, which I realized, of course,
only after writing code for explicitly supporting syscall functions.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14680 a95241bf-73f2-0310-859d-f6bbb57e9c96