[PATCHJ] Fix for diagnosing half pointers/arrays

[Joey Gouly]

Hi all,

In r173254 I committed some changes to add support for 'half' type to clang.

I got some of the error cases wrong, and produced a diagnostic for '&h[0]'
and '&*h',
which are both defined to always produce a pointer. C99 6.5.3.2, footnote
84.

Does this look like a good fix?

Thanks,
Joey
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