PATH to inherits_from_p

[Per Bothner]

I checked the atached patch into mainline.
It is probably appropriate for 4.0.2.

The problem is that CLASSTYPE_SUPER may be unset if we haven't loaded 
the class yet, which can obviously lead to various failures.  In the 
case that motivated the patch, I got an error about a throws specifier
because it there's wasn't a matching throws in the super class. 
However, it wasm't needed since it was a RuntimeException.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/
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