[PATCH] array_length, array_end macros for internal use

[Florian Weimer]

I just encountered yet another case where I had to use the sizeof (A) / 
sizeof (A[0]) idiom, so I wrote a general macro for it, with type 
validation.

I put it into a separate header so that it can be used both from the 
library and (non-internal) tests.

The macro as written is not compatible with C++ because it uses 
__builtin_types_compatible_p for explicitness.  If we need something 
like this in C++ mode, we should write it as a (constexpr) template 
function.

If accepted, I will commit the stdio-common subdirectory conversion 
separately from the header, to simplify backports.

Thanks,
Florian
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