Missing join_array_axes transformation
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- Python
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Description
Consider the [`face_mass` kernel](https://github.com/inducer/grudge/blob/c7cd63da6ea1dfc1b992b0bb15760ca98a9a08f4/grudge/execution.py#L339). The `f` and `j` dimensions could be joined, shrinking the array dimensions from 3D to 2D. Currently there is a [`split_array_axis`](https://github.com/inducer/loopy/blob/186f5095a54982b7eb2fda5e4b995d7c047fde1e/loopy/transform/padding.py#L369) transformation but no `join_array_axes` transformation so this is not possible presently.
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