cranelift: Test calling across different calling conventions (#4801)

* cranelift: Test calling across different calling conventions

* cranelift: Use `wasmtime_system_v` calling convention for cross cc tests

cranelift/filetests/src/function_runner.rs

@@ -326,10 +326,6 @@ impl<'a> Trampoline<'a> {
 /// Compilation Error when compiling a function.
 #[derive(Error, Debug)]
 pub enum CompilationError {
-    /// This Target ISA is invalid for the current host.
-    #[error("Cross-compilation not currently supported; use the host's default calling convention \
-    or remove the specified calling convention in the function signature to use the host's default.")]
-    InvalidTargetIsa,
     /// Cranelift codegen error.
     #[error("Cranelift codegen error")]
     CodegenError(#[from] CodegenError),