WebKit JSC - 'BytecodeGenerator::emitGetByVal' Incorrect Optimization (1)

Let's start with JS code. let o = ; for let i in xx: 0 oi; 0; i-- ForInContext& context = mforInContextStacki - 1.get; if context.local != property continue; if !context.isValid break; if context.type == ForInContext::IndexedForInContextType property = staticcastcontext.index; break;...