Alex Bradbury ef9cf86eb0 [WebAssembly][NFC] Delete type checking logic for removed ref.null instruction
D114979 changed the textual formal of ref.null - dropping ref.null in
favour of ref.null_extern and ref.null_func. Therefore, the type checker
no longer needs logic to handle "ref.null".

Differential Revision: https://reviews.llvm.org/D122123
2022-03-22 16:24:05 +00:00
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