v5.4/970a4a3418e626d0d4220edd4e981ecbf9d87758

970a4a3418e6 ("perf pmu: Add flex debug build flag")
8d54c308c87f ("perf parse-events: Use automatic variable for flex input")
26226a97724d ("perf expr: Move expr lexer to flex")
576a65b6974d ("perf expr: Add expr.c object")