Windows release build for xenia-project/xenia@24205ee.
[x64] Fix VECTOR_SH{L,R,A}_V128(Int8) masking
AltiVec
doc says that it just uses the lower log2(n) bits of the shift-amount
rather than the whole element-sized value. So there is no need to handle
an overflow. Also adjusts 64-bit literals to utilize the explicit
UINT64_C type.