feat: add polyfills insertion for ES Next used features

js/js.translator/testData/box/polyfills/tanh/tanhWithExistedIntrinsic.kt

@@ -0,0 +1,26 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.tanh = function tanh(x) {
+    tanh.called = true;
+    switch (x) {
+        case -1: return -0.7615941559557649
+        case 0: return 0
+        case 1: return 0.7615941559557649
+        case Infinity: return 1
+    }
+}
+
+// FILE: main.kt
+import kotlin.math.tanh
+
+fun box(): String {
+    assertEquals(tanh(-1.0), -0.7615941559557649)
+    assertEquals(tanh(0.0), 0.0)
+    assertEquals(tanh(1.0), 0.7615941559557649)
+    assertEquals(tanh(Double.POSITIVE_INFINITY), 1.0)
+
+    assertEquals(js("Math.tanh.called"), true)
+
+    return "OK"
+}

js/js.translator/testData/box/polyfills/tanh/tanhWithoutExistedIntrinsic.kt

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+// TARGET_BACKEND: JS_IR
+// FILE: main.js
+Math.tanh = undefined;
+
+// FILE: main.kt
+import kotlin.math.tanh
+
+fun box(): String {
+    assertEquals(tanh(-1.0), -0.7615941559557649)
+    assertEquals(tanh(0.0), 0.0)
+    assertEquals(tanh(1.0), 0.7615941559557649)
+    assertEquals(tanh(Double.POSITIVE_INFINITY), 1.0)
+    assertEquals(js("Math.tanh.called"), js("undefined"))
+
+    return "OK"
+}