[commit, 6.0] Add frame_unwind_address_in_block

[Andrew Cagney]

Hello,

This patch adds the function pair:
	frame_unwind_address_in_block
	get_frame_address_in_block
as successors to:
	frame_address_in_block
The new methods are more correct (they handle dummy as well as sigtramp 
frames) and follow a consistent nameing schema.

The expectation is that frame sniffers will use 
frame_unwind_address_in_block as a way of obtaining a PC that falls 
within the function.

A follow on patch will switch the mainline to get_frame_address_in_block 
while the 6.0 branch will be left as-is.

committed to 6.0 and the mainline
Andrew

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