riscv: Always inline bitops

riscv: Always inline bitops

When building allmodconfig + ThinLTO with certain versions of clang,
arch_set_bit() may not be inlined, resulting in a modpost warning:

  WARNING: modpost: vmlinux: section mismatch in reference: arch_set_bit+0x58 (section: .text.arch_set_bit) -> numa_nodes_parsed (section: .init.data)

acpi_numa_rintc_affinity_init() calls arch_set_bit() via __node_set()
with numa_nodes_parsed, which is marked as __initdata. If arch_set_bit()
is not inlined, modpost will flag that it is being called with data that
will be freed after init.

As acpi_numa_rintc_affinity_init() is marked as __init, there is not
actually a functional issue here. However, the bitop functions should be
marked as __always_inline, so that they work consistently for init and
non-init code, which the comment in include/linux/nodemask.h alludes to.
This matches s390 and x86's implementations.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Yury Norov <yury.norov@gmail.com>