Update Binaryen to latest; Various fixes

lib/loader/tests/assembly/index.ts

@@ -50,3 +50,13 @@ export function sum(arr: Int32Array): i32 {
   for (let i = 0, k = arr.length; i < k; ++i) v += arr[i];
   return v;
 }
+
+export function varadd(a: i32 = 1, b: i32 = 2): i32 {
+  return a + b;
+}
+
+export const varadd_ptr = varadd;
+
+export function calladd(fn: (a: i32, b: i32) => i32, a: i32, b: i32): i32 {
+  return fn(a, b);
+}