[patch rfc] Lazy compute the frame's type

[Andrew Cagney]

Hello,

This modifies the new frame code so that even the frame's type (and 
unwind method) are computed on demand.

By reducing the overhead of creating an initial inner-most frame to 
`zero', any potential concern over creating the inner-most frame in 
inf*.c is eliminated, and the possibility of some inf*.c cleanups gets 
that bit closer.

Well, almost.  Just need to fix that small problem with the PC and 
DECR_PC_AFTER_BREAK.

I'll look to commit in a few days,
Andrew
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