[commit] Switch mainline unwind predicates to sniffers

[Andrew Cagney]

Hello,

This is the next step in `fixing' the dwarf2 backtrace problem.  It's 
highly mechanical - replace XXX_frame_p(pc) with 
XXX_frame_sniffer(next_frame).  I've rebuilt all the cross targets and 
checked that i386 results didn't change.

committed to mainline only,
Andrew
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