- Refactored instrinsic support helper class to become the StructuredArrayIntrinsifiableBase base class. This base class now captures both the methods and fields that a JDK's intrinsified/optimized implementation of StructuredArray is expected to change under the hood.

- A few cleaup steps (removed redundant passing of dimensionCount, formalized ArrayConstructorArgs to avoid messy/error-prove overloading and casting of Object[] args at specific indexes, etc.)