[rfc, i386] Convert output_mi_thunk to rtl

[Richard Henderson]

I developed this patch while working on the dwarf2 pass series.
This was before I bypassed the entire problem by removing the
!deep branch prediction paths.

Ideally, we'd do this generically from gimple.  Less ideally,
but still better, is to always emit rtl, and support that in
the middle end without so many hacks in the back end.

I think this cleans things up a bit over emitting text.
Particularly if we then include HJ's x32 stuff.

Thoughts?


r~
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