Change libcall signatures to match wasm argument order

I'm wondering if there's a chance we could make the signatures of the libcalls compatible with the Wasm spec, that way we would avoid having to pre-process the stack (at least for the already existing values) before emitting calls.

_Originally posted by @saulecabrera in https://github.com/bytecodealliance/wasmtime/pull/7155#discussion_r1347468699_