[clang] [llvm] [WebAssembly] Represent reference types as TargetExtType (PR #203165)

[Demetrius Kanios via cfe-commits]

QuantumSegfault wrote:

> Looks like my new test isn't properly skipped when the wasm target isn't built.

Already taken care of: #203165

https://github.com/llvm/llvm-project/pull/203165