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WIP: Improve code generation for closure ref counting

The reference counting used with closures generates very poor code on arm64. As a result the closures test takes >150 min to run to completion on a particular arm64 platform.

This small set of patches updates the ref counting used in closure to generate tighter code which results in significant speeds. The closures test now takes ~20 min on the same hardware.

Closes: #1316

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