ptrace: Introduce exception_ip arch hook

ptrace: Introduce exception_ip arch hook

Origin: https://git.kernel.org/linus/11ba1728be3edb6928791f4c622f154ebe228ae6

On architectures with delay slot, architecture level instruction
pointer (or program counter) in pt_regs may differ from where
exception was triggered.

Introduce exception_ip hook to invoke architecture code and determine
actual instruction pointer to the exception.

Link: https://lore.kernel.org/lkml/00d1b813-c55f-4365-8d81-d70258e10b16@app.fastmail.com/
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name ptrace-Introduce-exception_ip-arch-hook.patch