Remove specialization of toTypedArray for LongArray and BooleanArray in JS

The default implementation for primitive arrays returns an array of correct type.

#KT-29187 Fixed

libraries/stdlib/js/test/collections/ArraysJsTest.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package test.js.collections
+
+import kotlin.test.*
+
+class ArraysJsTest {
+    @Test
+    fun toTypedArrayIsObjectArray() {
+        fun checkIsObjectArray(array: Any, arrayType: String) = assertTrue(array is Array<*>, "$arrayType.toTypedArray() is not Array<*>")
+        checkIsObjectArray(intArrayOf(1).toTypedArray(), "IntArray")
+        checkIsObjectArray(longArrayOf(1).toTypedArray(), "LongArray")
+        checkIsObjectArray(charArrayOf('a').toTypedArray(), "CharArray")
+        checkIsObjectArray(booleanArrayOf(false).toTypedArray(), "BooleanArray")
+    }
+}