[CFT, delay slots] Fix middle-end/49977

[Richard Henderson <rth at twiddle dot net>]

This seems to do the trick for sim testing of sh-elf and cris-elf.

I'm interested in advice re debugging experiences with delay slots.
It seems like for calls there's no alternative but to have the unwind
info be incorrect when stopped at the call insn itself.

It also seems like we've similarly been generating unwind info that
was incorrect for branches with frame-related insns in delay slots.
Further, that by delaying the unwind info until after the sequence
we can avoid that incorrectness.

Have any of you experienced that incorrectness before, when debugging
on your respective targets?


r~

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