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- Refactored & fixed typeuse parsing rules so now the rules more closely
follow the spec. There have been multiple parsing rules that were
different in subtle ways, which are supposed to be the same according
to the spec.
- Duplicate types, i.e., types with the same signature, in the type
section are allowed as long as they don't have the same given name.
If a name is given, we use it; if type name is not given, we
generate one in the form of `$FUNCSIG$` + signature string. If the
same generated name already exists in the type section, we append
`_` at the end. This causes most of the changes in the autogenerated
type names in test outputs.
- A typeuse has to be in the order of (type) -> (param) -> (result),
if more than one of them exist. In case of function definitions,
(local) has to be after all of these. Fixed some test cases that
violate this rule.
- When only (param)/(result) are given, its type will be the type with
the smallest existing type index whose parameter and result are the
same. If there's no such type, a new type will be created and
inserted.
- Added a test case `duplicate_types.wast` to test type namings for
duplicate types.
- Refactored `parseFunction` function.
- Add more overrides to helper functions: `getSig` and
`ensureFunctionType`.
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