[libc] Improve Cortex `memset` and `memcpy` functions (#149044) The code for `memcpy` is the same as in #148204 but it fixes the build bot error by using `static_assert(cpp::always_false<decltype(access)>)` instead of `static_assert(false)` (older compilers fails on `static_assert(false)` in `constexpr` `else` bodies). The code for `memset` is new and vastly improves performance over the current byte per byte implementation. Both `memset` and `memcpy` implementations use prefetching for sizes >= 64. This lowers a bit the performance for sizes between 64 and 256 but improves throughput for greater sizes.
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