285bc5ce24
* Implement variant translation in fused adapters This commit implements the most general case of variants for fused adapter trampolines. Additionally a number of other primitive types are filled out here to assist with testing variants. The implementation internally was relatively straightforward given the shape of variants, but there's room for future optimization as necessary especially around converting locals to various types. This commit also introduces a "one off" fuzzer for adapters to ensure that the generated adapter is valid. I hope to extend this fuzz generator as more types are implemented to assist in various corner cases that might arise. For now the fuzzer simply tests that the output wasm module is valid, not that it actually executes correctly. I hope to integrate with a fuzzer along the lines of #4307 one day to test the run-time-correctness of the generated adapters as well, at which point this fuzzer would become obsolete. Finally this commit also fixes an issue with `u8` translation where upper bits weren't zero'd out and were passed raw across modules. Instead smaller-than-32 types now all mask out their upper bits and do sign-extension as appropriate for unsigned/signed variants. * Fuzz memory64 in the new trampoline fuzzer Currently memory64 isn't supported elsewhere in the component model implementation of Wasmtime but the trampoline compiler seems as good a place as any to ensure that it at least works in isolation. This plumbs through fuzz input into a `memory64` boolean which gets fed into compilation. Some miscellaneous bugs were fixed as a result to ensure that memory64 trampolines all validate correctly. * Tweak manifest for doc build
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