History of helper 1 change

In crates/flow/src/syscall.rs, lines 454–485 on 72e9cfca63b535d6cef20a3169d7305da8548271fbd7e51691f3f6974a20671a. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 454,485:crates/flow/src/syscall.rs.