strace: Improvements

- Added some utility functions to the `Context` class.
- Updated the `sockaddr` handler to retrieve the next sibling
rather than the sibling at index 2. This allows the handler to
work for syscalls where the `socklen_t` argument is not the third
one, for example, `_kern_recvfrom`.
- Added the ability to print the `flatArgs` for `_kern_exec` and
`_kern_load_image`.

Change-Id: Ia4cf0a30a5cf972274820bbf068101450db52189
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6498
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

strace: support trace for poll() and select()

in the case of poll(), the events should be printed before the actual syscall,
and the revents after, while taking in account the return value.
thus B_DEBUGGER_MESSAGE_PRE_SYSCALL needs to be enabled and handled.
the attribute "preSyscall" is added to identify such syscalls, and the parameters
are identified with the attribute "inOut".

Change-Id: I390643ea176c720738c5ec4fc75a3a4c7125a3cd
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4763
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

* Moved strace sourced to src/bin/debug/.
* Factored a few functions out of strace that can be reused.
* Added the beginnings of a "profile" command. It is very much work in
progress, though it is already able to profile the main thread of a
program.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27533 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Moved strace sourced to src/bin/debug/.
* Factored a few functions out of strace that can be reused.
* Added the beginnings of a "profile" command. It is very much work in
progress, though it is already able to profile the main thread of a
program.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27533 a95241bf-73f2-0310-859d-f6bbb57e9c96