Marcus Nilsson 5fa9747105 LibWasm: Parse and validate typeuse references ...

This adds parsing of `(ref typeidx)` and validates that `typeidx` is a
valid index. Currently, nullability of the reference is lost.

A bug causing the code below to fail parsing has been fixed.
```wat
(module
  (type $T (struct (field i32) (field f32)))
  (type $T1 (struct (field i32) (field f32)))
  (; many more types... ;)
  (type $T64 (struct (field i32) (field f32)))
  (type $f (func (result (ref null $T64))))
)
```

The spec tests type-equivalence.{0,1,3,13} have been disabled as they
were previously false positives.

2026-02-10 13:00:16 +01:00

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