Fix JS DCE removing reachable functions

js/js.translator/testData/dce/arrayAccess.js

@@ -0,0 +1,17 @@
+(function(_) {
+    var x = {};
+    function foo() {
+        return x["bar"]();
+    }
+    x.bar = function() {
+        return "bar";
+    };
+    x.baz = function() {
+        return "baz";
+    };
+    _.foo = foo;
+})(module.exports);
+
+// REQUEST_REACHABLE: main.foo
+// ASSERT_REACHABLE: x.bar
+// ASSERT_UNREACHABLE: x.baz

js/js.translator/testData/dce/localVarAndFunction.js

@@ -0,0 +1,27 @@
+(function(_, Kotlin) {
+    Kotlin.defineInlineFunction("bar", Kotlin.wrapFunction(function() {
+        function baz() {
+            return "bar";
+        }
+        return function() {
+            return baz();
+        };
+    }));
+    return _;
+})(module.exports, require("kotlin"));
+
+(function(_) {
+    function baz() {
+        return "baz";
+    }
+
+    function foo() {
+       return baz();
+    }
+    _.foo = foo;
+})(module.exports);
+
+
+// REQUEST_REACHABLE: main.foo
+// ASSERT_REACHABLE: main.foo
+// ASSERT_REACHABLE: baz

js/js.translator/testData/dce/typeOf.js

@@ -0,0 +1,15 @@
+(function(_) {
+    var x = {};
+    x.y = {};
+    x.y.bar = function() {
+        return "bar";
+    };
+    function foo() {
+        return typeof x.y;
+    }
+    _.foo = foo;
+})(module.exports);
+
+// REQUEST_REACHABLE: main.foo
+// ASSERT_REACHABLE: x.y
+// ASSERT_UNREACHABLE: x.y.bar