1. I fixed the Clang build.
1. I removed what I think is an unnecessary `ptrtoint` in
`rpcs3/Emu/Cell/PPUTranslator.cpp`. I am not 100% sure that it's
correct, but I tested a small LLVM IR snippet and it didn't make a
difference. The ASM code was the same.
1. I also changed the definition of `prefetch_write` from `return
__builtin_prefetch(ptr, 1, 0);` to `return __builtin_prefetch(ptr, 1,
3);` because that's how `_m_prefetchw` is defined in GCC.
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