This allows e.g. the following programming pattern:
```
RecursiveCoroutine<std::optional<SomeType>> f();
int g() {
return *f();
}
```
Without operator* defined for `RecursiveCoroutine` this would fail,
requiring an explicit cast such as:
```
int g() {
return *static_cast<std::optional<SomeType>>(f());
}
```
Before this commit `is_specialization<const X<T>, X>` was not
specialized, so that `const X<T>` did not count as a specialization of
`X`. This resulted in bad selection of template specialization based on
concepts that were using `is_specialization_v`, such as
`IsUpcastablePointer`.
This commit fixes the problem, so that now the concept
`IsUpcastablePointer` is true for `const UpcastablePointer<T>` as well.
This also enabled to remove some workarounds for the `IsMutableSet` and
`IsSortedVector` concepts, and treat them uniformly with other concepts
that were using `is_specialization_v`.
Before this commit, it was only matched by types that satisfied the
constraint `IsUpcastablePointer`, which is too strict.
Now also types that match `UpcastablePointerLike` satisfy the
constraints for this concept.
The following bugs have been fixed:
* PromoteCSV no longer mixes `alloca` with other instructions, which is
a convention in LLVM IR that some passes rely upon.
* Before this commit, we were detecting if *calls to CSV initializers*
where already present in order to reuse them, but this was not right,
we need to reuse the *alloca* instructions they are associated
with. This commit does exaclty that.
This commit makes sure that GeneratedCodeBasicInfo can be used even in
absence of the `root`.
This also ensure that no time is wasted on brief/focused pipelines that
do not care about analyzing each basic block in the `root` function.
* Rename from compare-json.py to compare-yaml
* Handle YAML
* Support certain characteristics of the model
* Use subgraph matching to perform comparisons
* Introduce some testing
* Drop Python 2 support
* Reformat
Pietro Fezzardi