[patch/rfc] Switch to generic_func_frame_chain_valid()

[Andrew Cagney]

Hello,

This finishes off (I think) the FRAME_CHAIN_VALID debate.  It sets it to 
generic_func_frame_chain_valid().  That function being tweaked to handle 
both generic dummy frame and the old style frame cases.

I'll commit it in a few days.

Andrew
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