Improve side_effect_guards to (1) avoid aliasing non-tensors and (2) combine...

Improve side_effect_guards to (1) avoid aliasing non-tensors and (2) combine aliasing with re-indenting. Move the renaming visitor into a generic utility API.
This loses potential efficiency by risking sequencing ops where there is no risk of a race. On the other hand it's still not entirely robust, and we need to raise an error where we can't guarantee that.

PiperOrigin-RevId: 184717456