Fix #23182 - Duplicate __aaget declaration for simple expression with associative array

[rainers]

The underlying issue exists forever: arrExp should not be evaluated twice in arrExp.length++ if non-trivial

[dlang-bot]

Thanks for your pull request, @rainers!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + dmd#23189"