Function optimization_trace_run 

pub fn optimization_trace_run(source: &str) -> BackendOptimizationTrace

The optimizations that fired on the RUN path — the VM/interpreter optimizer (optimize_for_run) — for source. The run-path analogue of optimizations_fired (which traces the AOT codegen path); it surfaces the run-path-only passes — inlining, loop-carried CSE, float strength reduction — the AOT trace cannot see. Respects file-level ## No <opt> decorators.