feat: add polyfills insertion for ES Next used features

js/js.translator/testData/box/polyfills/trunc/truncWithExistedIntrinsic.kt

@@ -0,0 +1,25 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.trunc = function trunc(x) {
+    trunc.called = true;
+    if (isNaN(x)) {
+        return NaN;
+    }
+    if (x > 0) {
+        return Math.floor(x);
+    }
+    return Math.ceil(x);
+}
+
+// FILE: main.kt
+import kotlin.math.truncate
+
+fun box(): String {
+    val result = truncate(1.188)
+
+    assertEquals(result, 1)
+    assertEquals(js("Math.trunc.called"), true)
+
+    return "OK"
+}

js/js.translator/testData/box/polyfills/trunc/truncWithoutExistedIntrinsic.kt

@@ -0,0 +1,16 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.trunc = undefined;
+
+// FILE: main.kt
+import kotlin.math.truncate
+
+fun box(): String {
+    val result = truncate(1.188)
+
+    assertEquals(result, 1)
+    assertEquals(js("Math.trunc.called"), js("undefined"))
+
+    return "OK"
+}