to make sure :opt_invokebuiltin_delegate_leave doesn't become :(trace_)opt_invokebuiltin_delegate.
This is to prevent a warning like
/tmp/ruby/v3/src/trunk-test/test/ruby/test_jit.rb:618: warning: 'opt_invokebuiltin_delegate_leave' insn is not included in the script. Actual insns are: opt_invokebuiltin_delegate leave
Collect insns from a child process
to make sure :opt_invokebuiltin_delegate_leave doesn't become
:(trace_)opt_invokebuiltin_delegate.
This is to prevent a warning like