Fix a bug in struct inheritance (#1861)

During lowering from AST to IR, the Slang compiler translates code that uses `struct` inheritance:

```hlsl
struct Base { int a; }
struct Derived : Base {}
```

into code where the inheritance relationship is "witnessed" by a simple field:

```hlsl
struct Base { int a; }
struct Derived { Base __anonymous_field__; }
```

The underlying bug here is that the `__anonymous_field__` that the compiler generated during IR lowering was not being given any linkage decorations (no mangled name). As a result, if multiple separately-compiled modules all access that field they could disagree on its identity as an IR instruction. This could lead to output code being generated where the declaration of `__anonymous_field__` uses one IR instruction, but accesses use another.

This change includes a fix for the issue, and a test that serves as a reproducer for the original problem.

0 files changed, 0 insertions, 0 deletions