[rfc] Only compare against dummy frame's top when explicitly set

[Andrew Cagney]

Hello,

To follow up an earlier thread, the attached revised patch modifies 
generic_find_dummy_frame() so that it only tests TOP when it was set.
However, this time it uses the value of TOP instead of 
find_dummy_frame_p().  I think this is more robust since, as with the 
ia64, it allows an architecture to explicitly set TOS (rather than rely 
on hand_function_call() to set it).

I'm intending to commit this in a few days (~monday).  I should note 
that there is evidence that the change, while arguably correct, will 
break something.  cf, the fixes I recently made to the rs6000 because 
the change flushes out bugs in that target that the incorrect test was 
hiding.

Thoughts before the commit?

Andrew
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