[mono] Fix `LLVMArgWasmVtypeAsScalar` when a method doesn't set its return value#101299

kotlarmilos merged 8 commits intodotnet:maindotnet/runtime:mainfrom

kotlarmilos:bugfix/llvm-wasmvtypeasscalar-noretkotlarmilos/runtime:bugfix/llvm-wasmvtypeasscalar-noretCopy head branch name to clipboard