This replaces most uses of newArray(size) with the following
sequence:

1. new raw array, without filling entries with nil
2. population code, append values into the array
3. finish raw array, only populate remaining entries with nil

This reduces the overhead for constructing these arrays by avoiding
the pre-population with nil values for elements that will just be
overwritten anyway.

This guarantees we do not accidentally start referencing any
surrounding state and allocating a lambda object.

* Use more newRawArray where appropriate
* Use newEmptyArray for more arrays intended to be empty
* Provide "each" logic for global names
* More efficient iteration of Java methods in JavaLang Class ext