f3d1a53fa6
11772: Support constants in const eval r=HKalbasi a=HKalbasi
This PR enables evaluating things like this:
```rust
const X: usize = 2;
const Y: usize = 3 + X; // = 5
```
My target was nalgebra's `U5`, `U22`, ... which are defined as `type U5 = Const<{ SomeType5::SOME_ASSOC_CONST }>` but I didn't find out how to find the `ConstId` of the implementation of the trait, not the trait itself (possibly related to #4558 ? We can find associated type alias, so maybe this is doable already) So it doesn't help for nalgebra currently, but it is useful anyway.
Co-authored-by: hkalbasi <hamidrezakalbasi@protonmail.com>
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