logging: avoids logging activity to stdio file descriptors (#1007)

This avoids logging activity on stdio file descriptors, in order to help
make troubleshooting easier. Usually, there isn't an issue in these, yet
wasm panics are harder to read if there is also logging of the ..
logging.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

internal/gojs/goos/goos.go

@@ -251,3 +251,14 @@ func (f *stackFunc) Call(ctx context.Context, mod api.Module, wasmStack []uint64
 func NewStack(name string, mem api.Memory, sp uint32) *stack {
 	return &stack{goarch.NewStack(name, mem, sp)}
 }
+
+var Undefined = struct{ name string }{name: "undefined"}
+
+func ValueToUint32(arg interface{}) uint32 {
+	if arg == RefValueZero || arg == Undefined {
+		return 0
+	} else if u, ok := arg.(uint32); ok {
+		return u
+	}
+	return uint32(arg.(float64))
+}