fix: cache call expressions in render tag arguments

[dummdidumm]

Ensure that they're called at most once per change, not once per access within the snippet
fixes #12187

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[Rich-Harris]

I think we should avoid walking up the tree inside visitors, it's a lot of unnecessary work to do every time we encounter a CallExpression. Can we put the current render tag on state instead? That's what state is for

[dummdidumm]

Yeah I can change that - it felt stupid to add to state for just that reason, but it is what it is.