Fix incomplete initialization of declspecs

[Bernd Schmidt]

I've noticed that build_null_declspecs fails to clear out all location 
information since it's missing a multiplication with the type size. The 
simplest fix seems to be to just clear the entire structure.

Bootstrapping & testing now on x86_64-linux, ok if that succeeds? 
Depending on what we do for 69733, this might be a prerequisite patch.


Bernd
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