normalize types every time HR regions are erased

Associated type normalization is inhibited by higher-ranked regions.
Therefore, every time we erase them, we must re-normalize.

I was meaning to introduce this change some time ago, but we used
to erase regions in generic context, which broke this terribly (because
you can't always normalize in a generic context). That seems to be gone
now.

Ensure this by having a `erase_late_bound_regions_and_normalize`
function.

Fixes #37109 (the missing call was in mir::block).

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