JS/Inlining: introduce removal of expression statements without side effects

js/js.tests/test/org/jetbrains/kotlin/js/test/optimizer/BasicOptimizerTest.kt

@@ -72,7 +72,7 @@ abstract class BasicOptimizerTest(private var basePath: String) {
         for (statement in unoptimizedAst) {
             object : RecursiveJsVisitor() {
                 override fun visitFunction(x: JsFunction) {
-                    FunctionPostProcessor(x.body).apply()
+                    FunctionPostProcessor(x).apply()
                     super.visitFunction(x)
                 }
             }.accept(statement)

js/js.tests/test/org/jetbrains/kotlin/js/test/optimizer/IneffectiveStatementEliminationTest.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.js.test.optimizer
+
+import org.junit.Test
+
+class IneffectiveStatementEliminationTest() : BasicOptimizerTest("ineffective-statement-elimination") {
+    @Test fun binary() = box()
+
+    @Test fun unary() = box()
+
+    @Test fun conditional() = box()
+
+    @Test fun literal() = box()
+}