Maybe similar to  issue 662861 ?

# Minimized program:
function foo() {
  var v = { valueOf: function() { return boom++; } };
  v++;
}
foo();


# Compared fullcode with noturbo_opt

# Flags of fullcode:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit  --random-seed -1632457604 --nocrankshaft --turbo-filter=~
# Flags of noturbo_opt:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit  --random-seed -1632457604 --always-opt --turbo-filter=~ --noturbo-asm

Difference:
- output15_noturbo_opt/fuzz-69147.js.minimized:2: ReferenceError: boom is not defined

### Start of configuration fullcode:
output15_noturbo_opt/fuzz-69147.js.minimized:2: ReferenceError: boom is not defined
  var v = { valueOf: function() { return boom++; } };
                                         ^
ReferenceError: boom is not defined
    at Object.valueOf (output15_noturbo_opt/fuzz-69147.js.minimized:2:42)
    at foo (output15_noturbo_opt/fuzz-69147.js.minimized:3:3)
    at output15_noturbo_opt/fuzz-69147.js.minimized:5:1


### End of configuration fullcode

### Start of configuration noturbo_opt:

### End of configuration noturbo_opt