selftests/bpf: libarena: Optimize and make public arena_memset

Clang currently provides no __builtin_{memset, memcpy, memcmp}
for its BPF backend. This is especially an issue for arena code
that is more likely to do these operations on buffers with user-provided
bounds. One example is the arena ASAN implementation that uses
memset to update the shadow bitmap. Arena ASAN actually already
has a naive implementation of this operation. Another user would
be a calloc() call that has to zero the memory it returns.

Introduce a more optimized version of the memset() operation for
arena memory and make it public to all libarena users. The operation
uses word-sized assignments to speed up the function for larger sizes.
We expose the function through common.h to allow for inlining from
the callers.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260817191616.11071-7-emil@etsalapatis.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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