Add profiling for opt_send_without_block

Split out from the CCall changes since we discussed during pairing that
this is useful to unblock some other changes. No tests since no one
consumes this profiling data yet.

insns.def

@@ -890,6 +890,7 @@ opt_send_without_block
 (CALL_DATA cd)
 (...)
 (VALUE val)
+// attr bool zjit_profile = true;
 // attr bool handles_sp = true;
 // attr rb_snum_t sp_inc = sp_inc_of_sendish(cd->ci);
 // attr rb_snum_t comptime_sp_inc = sp_inc_of_sendish(ci);