non-local goto optimization

[Nathan Sidwell]

Eric Botcazou wrote:

> So it seems that we really need a new flag in struct function after all.
> But I would rather name it "calls_unwind_init" like a few others and invoke 
> the new has_nonexceptional_receiver predicate directly from reload.

ok, I'll rework this and move those fields RichardG mentioned should be aligned.

nathan

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