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In preparation for porting the checksum code to other arches, make its functionality independent from the CFG reverse engineering code. Move it into a standalone calculate_checksums() function which iterates all functions and instructions directly, rather than being called inline from do_validate_branch(). Since checksum_update_insn() is no longer called during CFG traversal, it needs to manually iterate the alternatives. Acked-by: Song Liu <song@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>