JS: fix bug in temporary variable elimination

js/js.inliner/src/org/jetbrains/kotlin/js/inline/clean/TemporaryVariableElimination.kt

@@ -130,6 +130,9 @@ internal class TemporaryVariableElimination(private val function: JsFunction) {
                             temporary += name
                         }
                     }
+                    else {
+                        super.visitExpressionStatement(x)
+                    }
                     return
                 }
                 super.visitExpressionStatement(x)

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

@@ -40,4 +40,6 @@ class TemporaryVariableEliminationTest : BasicOptimizerTest("temporary-variable"
     @Test fun innerExpressionProcessed() = box()
 
     @Test fun transitiveNotConsideredTrivial() = box()
+
+    @Test fun assignmentToNonLocal() = box()
 }

js/js.translator/testData/js-optimizer/temporary-variable/assignmentToNonLocal.optimized.js

@@ -0,0 +1,9 @@
+var result = "";
+
+function box() {
+    var $tmp;
+    $tmp = result;
+    result += "fail";
+    result = $tmp + "OK";
+    return result;
+}

js/js.translator/testData/js-optimizer/temporary-variable/assignmentToNonLocal.original.js

@@ -0,0 +1,9 @@
+var result = "";
+
+function box() {
+    var $tmp;
+    $tmp = result;
+    result += "fail";
+    result = $tmp + "OK";
+    return result;
+}