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Add selftests validating that BPF verifier handles precision marking for SCALAR registers derived from r10 (fp) register correctly. Given `r0 = (s8)r10;` syntax is not supported by older Clang compilers, use the raw BPF instruction syntax to maximize compatibility. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20240404214536.3551295-2-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>