[fuzz] Fix issues with single-inst module generator #4674
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This single-instruction test incorrectly attempted to convert an `i32` to an `i64`; the correct signature is `i64 -> i64`. See the [WebAssembly specification](https://webassembly.github.io/spec/core/bikeshed/#a7-index-of-instructions).
Previously, the `unary!` macro created functions that used two operands instead of the expected one.
alexcrichton
approved these changes
Aug 10, 2022
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While fuzzing with the new target in #4671, I discovered several issues with the single-instruction module generator:
i64.extend32_shad an incorrect signatureunary!macro was sometimes creating binary-argument functions