e6cf3bd267
Normalize consts in writeback when GCE is enabled
GCE lazily normalizes its unevaluated consts. This PR ensures that, like the new solver with its lazy norm types, we can assume that the writeback results are fully normalized.
This is important since we're trying to eliminate unnecessary calls to `ty::Const::{eval,normalize}` since they won't work with mGCE. Previously, we'd keep those consts unnormalized in writeback all the way through MIR build, and they'd only get normalized if we explicitly called `ty::Const::{eval,normalize}`, or during codegen since that calls `normalize_erasing_regions` (which invokes the `QueryNormalizer`, which evaluates the const accordingly).
This hack can (hopefully obviously) be removed when mGCE is implemented and we yeet the old GCE; it's only reachable with the GCE flag anyways, so I'm not worried about the implications here.
r? `@BoxyUwU`
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