[RFE] Print tracee's stack when ASSERT() fails

[Hi-Angel]

I am currently debugging an instance of

Assertion `t->regs().syscall_result_signed() == -syscall_state.expect_errno' failed to hold. Expected ENOSYS for 'io_destroy' but got result -22 (errno EINVAL); execution of syscall unsupported by rr

and the first thing I struggle with is that I have no idea where exactly rr fails. syscalls are typically hidden under 3rdparty libs, in particular I found that the io_destroy from this error message is wrapped over by io_queue_release, so I can't grep over the project for io_destroy.

I think it would be an immense help if in ASSERT() along with the internal trace rr would print the debuggee's stack as well.

[Hi-Angel]

(for reference: the assert per se comes from lack of libaio wrapper in rr, and there is a separate issue for that #3034)