[PATCHJ] Fix for diagnosing half pointers/arrays

[Joey Gouly]

Hi John,
> Just check whether the lvalue expression's type isHalfType() instead
> of trying to enumerate all the syntactic cases that can give rise to it.
Thanks. Please find a revised patch.

I also removed the opencl_cast_from_half diagnostic, since there isn't a
valid case
for "(float) expr", where expr would yield a half.

Any more comments?

Thanks,
Joey



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