P1 because it is regression - lost functionality.
Running with -XX:+UnlockDiagnosticVMOptions -XX:+LogCompilation -Xbatch shows only head and tail of <task> in hotspot log file (see attached):

<task compile_id='1' method='mathtest test (DI)D' bytes='26' count='2' backedge_count='5000' iicount='2' blocking='1' stamp='0.232'>
<task_done success='1' nmsize='824' count='2' backedge_count='5000' inlined_bytes='5' stamp='0.237'/>
</task>