[Wunsafe-buffer-usage] Turn off unsafe-buffer warning for methods annotated with clang::unsafe_buffer_usage attribute (#125671)
Unsafe operation in methods that are already annotated with
clang::unsafe_buffer_usage attribute, should not trigger a warning. This
is because, the developer has already identified the method as unsafe
and warning at every unsafe operation is redundant.
rdar://138644831
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Co-authored-by: MalavikaSamak <malavika2@apple.com>