This looks different to usual ignition stack trace differences. There is one frame missing.

# Minimized program
function __f_5() {
  stack = (new Error()).stack.split("\n")
  print(stack[stack.length - 1]);
}
function __f_4() {
  return __f_5();
}
function set() {
  var x = {};
  x.__defineSetter__('q', __f_4);
  x.q = 1;
}
var i = 0;
function rec() {
  set();
  i++;
  if (i > 6) return;
  (function() {
    rec();
  })();
}
rec();


# Compared fullcode with ignition_turbo_opt

# Flags of fullcode:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=461 --random-seed 45796542 --nocrankshaft --turbo-filter=~
# Flags of ignition_turbo_opt:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=461 --random-seed 45796542 --ignition-staging --turbo --always-opt

Difference:
-     at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
+     at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:19:5

### Start of configuration fullcode:
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)

### End of configuration fullcode

### Start of configuration ignition_turbo_opt:
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:22:1
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at rec (out11_ignition_turbo_opt2/fuzz-84647.js.minimized:20:5)
    at out11_ignition_turbo_opt2/fuzz-84647.js.minimized:19:5

### End of configuration ignition_turbo_opt