[patch/rfc] frame_pc_unwind()

[Andrew Cagney]

Hello,

The attached patch adds a per-frame frame_pc_unwind() method.  This goes 
with the per-frame frame_register_unwind() method (notice how the 
names/meanings match - unlike frame_saved_pc() vs get_saved_register() :-).

For a dummy frame it uses the dummy-frame version.  For other frames it 
falls back to  the existing FRAME_SAVED_PC() version.

This patch means that both GET_SAVED_REGISTER() and FRAME_SAVED_PC() 
have now officially been `put on notice'.  Need to demonstrate the 
replacement before they can be made obsolete though :-)

Baring comments, I'll commit this in a few days,

Andrew
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