fix logic for `dcEqIgnoreDistinct` in `sameType` (#24197)

fixes #22523

There were 2 problems with the code in `sameType` for
`dcEqIgnoreDistinct`:

1. The code that skipped `{tyDistinct, tyGenericInst}` only ran if the
given types had different kinds. This is fixed by always performing this
skip.
2. The code block below that checks if `tyGenericInst`s have different
values still ran for `dcEqIgnoreDistinct` since it checks if the given
types are generic insts, not the skipped types (and also only the 1st
given type). This is fixed by only invoking this block for `dcEq`;
`dcEqOrDistinctOf` (which is unused) also skips the first given type.
Arguably there is another issue here that `skipGenericAlias` only ever
skips 1 type.

These combined fix the issue (`T` is `GenericInst(V, 1, distinct int)`
and `D[0]` is `GenericInst(D, 0, distinct int)`).

#24037 shouldn't be a dependency but the diff follows it.

0 files changed, 0 insertions, 0 deletions