Fix __UINTPTR_TYPE__ definition after r211657

[Joerg Sonnenberger]

Hi all,
the attached patch ensures that __INTPTR_TYPE__ and __UINTPTR_TYPE__ are
consistent as the existing logic would pick e.g. long and unsigned int
on ARM. One issue I found during this is that the NVPTX backend is
using unsigned types here, which doesn't make sense to me.

Joerg
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