[patch/rfc] strengthn get_prev_frame() checks

[Andrew Cagney]

> Hello,
> 
> This improves the checks in get_prev_frame() that look for stuff like the top-of-stack or a corrupt stack.
> 
> d10v (which uses this) showed no regressions, neither did i386.
> 
> I'll commit `tomorrow'.
> 
> Andrew

With patch....

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