Rollup merge of #117046 - bvanjoi:fix-116186, r=oli-obk

return unfixed len if pat has reported error

- Fixes #116186
- Fixes #113021

This issue arises due to the creation of a fixed-length pattern, as a result of the mir body corruption. The corruption taints `tcx.eval_to_allocation_raw`, causing it to return `AlreadyReported`. Consequently, this prevents `len.try_eval_target_usize` from evaluating correctly and returns `None`. Lastly, it results in the return of `[usize; min_len]`.

To rectify this issue, my approach is that to return unfixed when encountering `ErrorHandled::Reported`. Additionally, in instances of `ErrorHandled::TooGeneric`, the previous logic has been reinstated.

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