Rollup merge of #129208 - veluca93:adt_const_fix, r=BoxyUwU

Fix order of normalization and recursion in const folding.

Fixes #126831.

Without this patch, type normalization is not always idempotent, which leads to all sorts of bugs in places that assume that normalizing a normalized type does nothing.

Tracking issue: rust-lang/rust#95174

r? BoxyUwU

Author: tgross35