Add KStackSetObjectValue, KStackSetUnboxValue

Add 2 macros for control stack operation.

[Old]
  KUnsafeFieldSet(sfp[n].asObject, ObjectPtr);
  sfp[n].intValue = intValue;

[New]
  KStackSetObjectValue(sfp[n].asObject, ObjectPtr);
  KStackSetUnboxValue(sfp[n].intValue, intValue);