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Check bpf_fastcall pattern detection when the pattern is entered at an instruction other than the first spill: - a jump to the first spill allows the rewrite; - conditional/unconditional a jump to the call or to the fill does not allow the rewrite. Reported-by: Nicholas Carlini <npc@anthropic.com> Suggested-by: Nicholas Carlini <npc@anthropic.com> Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20260903205820.1743087-2-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>