[RFA] epilogue unwinder for i386 (reverse 1/2)

[Michael Snyder]

Michael Snyder wrote:
> This comes out of a discussion with Daniel, about how gcc
> does not generate the right dwarf info to allow correct
> frame unwinding in function epilogues, causing frame_unwind
> to return bad results.
> 
> It's necessary for reverse-step, which will frequently step
> backward to the return instruction of a function.  But it also
> provides an improvement for forward debugging, in that now,
> without this change, if you STEPI until you are at the return
> instruction, you will get a bad backtrace.
> 
> The infrun changes that take advantage of this patch will follow
> separately.
> 
> Michael

Oops, the patch wasn't meant to have that "#if 0" in it...
corrected patch below.


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