[patch rfc] Lazy frame ID evaluation

[Andrew Cagney]

Hello,

Ref: Lazy get_frame_id()
http://sources.redhat.com/ml/gdb/2003-03/msg00243.html

The attached delays the computation of the frame ID until when it is 
needed.  Doing this (at least for targets using new frames) reduces the 
overhead of creating the initial frame - it avoids the need to do any 
prologue analysis until it is actually needed.

The follow on change is to exploit this in infrun.c, by using 
get_frame_type (get_current_frame ()) instead of PC_IN_SIGTRAMP() and 
PC_IN_DUMMY_FRAME().  They'll follow as separate changes.

Andrew
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