size_t, diffptr_t and others are translated to fixed size types

[Temtaime]

size_t is translated to uint/ulong depending on dpp flags, so generated .d files are not reusable for different archs.
I think that we can track such types and do not translate them to underlying types.

[atilaneves]

The generated .d files aren't supposed to be reusable - the point is to run dpp for each platform. The .d files are build artifacts.