This commit refactors the way record types are computed within the
optimizer. Previously, the optimizer would often reuse the existing
`NodeMetrics` for records, which could lead to stale or polymorphic
types.
The changes introduce a new function, `compute_record_type`, which
explicitly recalculates the `StaticType` for a `Record` node based on
the concrete types of its child fields. This ensures that after
optimizations like inlining and folding, record types are as concrete as
possible, eliminating unresolved `TypeVars`.
Additionally, the `folder.rs` module is updated to recompute the
`RecordLayout` when creating constant record values, further improving
type accuracy. Two new tests are added to verify that inlined records,
including those with multiple fields, correctly result in concrete
types.
Brummel
1f3fb40bcc