Commits on Apr 22, 2024

1. Fix a panic calling host functions with refs in async mode …

   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.

   

   alexcrichton committed Apr 22, 2024
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