c++ testsuite patches

[Jason Merrill]

>>>>> Horst von Brand <vonbrand@sleipnir.valparaiso.cl> writes:

 >> If I add
 >> 
 >>    extern void g(long);
 >> 
 >> I get the same warning as on an x86 box
 >> 
 >>    z.cc:4: warning: converting NULL to non-pointer type
 >> 
 >> and the test passes.

 > This is broken, IMHO.

No, this is correct.  __null is defined as a 0 of the integral type with
the same size as a pointer.  On the alpha, that would be 'long'.  So since
__null is 0L, clearly overload resolution should prefer the identity
conversion (long->long) to the null pointer conversion (NULL->void *).  Of
course, this is probably not what the programmer intended; thus the
warning.

Adding the long overload is the right thing.

Jason