Patch deleted all Deoptimize calling for CheckMaps in Machine Lowering phase of TurboShaft, which means TurboFan generated JITed code won't bail out if object's map is wrong.

Key Knowledge

What does Machine Lowering phase in TurboShaft do?

MachineLoweringReducer, formerly known as EffectControlLinearizer, lowers simplified operations to machine operations.
V8 Turbolizer for debugging
- Turbolizer is a HTML-based tool that visualizes optimized code along the various phases of Turbofan's optimization pipeline, allowing easy navigation between source code, Turbofan IR graphs, scheduled IR nodes and generated assembly code.
- Online V8 Turbolizer
V8 Native Syntax List
How to ensure a function is not inline or optimized compiled?
- Native Syntax: %NeverOptimizeFunction(func);
- No Native Syntax: Reduce the function's execution time.
Having patience and perseverance, persistently trying after failure!