AVRO-4051: Remove Superfluous Increments

[belugabehr]

What is the purpose of the change

• Trivial change to remove needless operations - faster ops, smaller package.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

This change added tests and can be verified as follows:

• Reviewed decompiled version to verify increments were no longer present

Documentation

• Does this pull request introduce a new feature? no

[KalleOlaviNiemitalo]

faster ops

Do benchmark results show such an effect? The code looks like a JIT bytecode-to-machinecode compiler should be able to replace all the uses of i with constants anyway, even if the Java-to-bytecode compiler doesn't do that.

[KalleOlaviNiemitalo]

By i I mean len 😞