dwarf2 unwinding for i386

[Michal Ludvig]

Hi all,
what do you think about adding dwarf2 unwinding (dwarf2cfi.c) to i386 
target? On x86-64 we are already using it for some time now and it seems 
to be quite stable. GCC folks are about to switch omit-frame-pointer on 
by default for i386 in a near future, but are waiting (as I understand 
it) for GDB to implement dwarf2 unwinding, so that the resulting code 
could be debugged. Can we make at least a testing branch with this 
support? Opinions? MarkK?

Michal Ludvig
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