feat: add polyfills insertion for ES Next used features

js/js.translator/testData/box/polyfills/log2/log2WithExistedIntrinsic.kt

@@ -0,0 +1,19 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.log2 = function log2(x) {
+    log2.called = true;
+    return Math.log(x) * Math.LOG2E;
+}
+
+// FILE: main.kt
+import kotlin.math.log2
+
+fun box(): String {
+    assertEquals(log2(1.0), 0)
+    assertEquals(log2(2.0), 1)
+    assertEquals(log2(4.0), 2)
+    assertEquals(js("Math.log2.called"), true)
+
+    return "OK"
+}

js/js.translator/testData/box/polyfills/log2/log2WithoutExistedIntrinsic.kt

@@ -0,0 +1,16 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.log2 = undefined;
+
+// FILE: main.kt
+import kotlin.math.log2
+
+fun box(): String {
+    assertEquals(log2(1.0), 0)
+    assertEquals(log2(2.0), 1)
+    assertEquals(log2(4.0), 2)
+    assertEquals(js("Math.log2.called"), js("undefined"))
+
+    return "OK"
+}