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Validate that 1-, 2-, and 4-byte loads from stack slots not aligned on 8-byte boundary still preserve zero, when loading from all-STACK_ZERO sub-slots, or when stack sub-slots are covered by spilled register with known constant zero value. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20231205184248.1502704-8-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>