selftests/bpf: libarena: Inline nonatomic bitmap operations

The libarena code currently defines the non-atomic bitmap set/get
operations as __weak functions, in accordance with the libarena
coding style. This, however, is significant overhead to call
functions that span single-digit instructions.

Make an exception and expose the getters/setters as static inline
functions in the header. Since the function body is now inlined
into the caller, mark reads/writes with READ_ONCE()/WRITE_ONCE()
to prevent compiler optimizations from breaking code that locklessly
polls the bitmap.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260817191616.11071-3-emil@etsalapatis.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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