Hi all,
The attached patch adds new function cfi_have_unwind_info() that I'll 
use for detection, whether a given function has a dwarf2 unwind info 
(from .eh_frame or .debug_frame) or not. I'll use it in the upcomming 
x86_64_frame_p() to detect which set of unwind functions should be 
returned for a given frame.

OK to commit?

Michal Ludvig
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