[PATCH] Fix one type mismatch in the C++ front-end (PR 22358)

[Andrew Pinski]

The problem here is that we don't convert BINFO_OFFSET to 
ptrdiff_type_node as the
other side of the cond_expr is that type and the type of cond_expr is 
declared as
that type.

This patch fixes the problem by calling convert on BINFO_OFFSET which 
fixes the
problem.

OK? Bootstrapped and tested on powerpc-darwin with no regressions.

The testcase was reduced from complex_io.cc in libstdc++ using the 
patch in PR 22368
to find this.

Thanks,
Andrew Pinski

ChangeLog:
	* class.c (build_base_path): Convert BINFO_OFFSET to the correct type.


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Testcase:
struct a
{
   virtual ~a();
};
struct b : virtual a { };
b a11;