FD kernel tracing: Capture kernel-only stack traces

* When exec()'ing we'd otherwise get (harmless but annoying) messages
from vm_page_fault(). With syscall tracing enabled we can get userland
s

FD kernel tracing: Capture kernel-only stack traces

* When exec()'ing we'd otherwise get (harmless but annoying) messages
from vm_page_fault(). With syscall tracing enabled we can get userland
stack traces anyway.
* Simplify by using TRACE_ENTRY_SELECTOR().

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bonefish+mmlr:
* Add file descriptor and IO context tracing.
* Some minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36272 a95241bf-73f2-0310-859d-f6bbb57e9c96