feat: add polyfills insertion for ES Next used features

js/js.translator/testData/box/polyfills/imul/imulWithExistedIntrinsic.kt

@@ -0,0 +1,18 @@
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.imul = function imul(a, b) {
+    imul.called = true;
+    return a * b
+}
+
+// FILE: main.kt
+fun box(): String {
+    val a: Int = 2
+    val b: Int = 42
+    val c: Int = a * b
+
+    assertEquals(c, 84)
+    assertEquals(js("Math.imul.called"), true)
+
+    return "OK"
+}