[20.0.0] Fix a panic calling host functions with refs in async mode #8439
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…lliance#8434) This commit fixes a panic when a host function defined with `Func::new` returned GC references and was called in async mode. The logic to auto-gc before the return values go to wasm asserted that a synchronous GC was possible but the context this function is called in could be either async or sync. The fix applied in this commit is to remove the auto-gc. This means that hosts will need to explicitly GC in these situations until auto-gc is re-added back to Wasmtime. cc bytecodealliance#8433 as this will make the behavior consistent, but we'll want to re-add the gc behavior.
fitzgen
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Apr 22, 2024
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Backport of #8434