JS/Inlining: introduce removal of unused variables

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

@@ -0,0 +1,5 @@
+function box() {
+    var a = 2;
+
+    return "OK";
+}

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

@@ -0,0 +1,7 @@
+function box() {
+    var a = 2;
+    var $b = a;
+    var $c = 2 + $b;
+
+    return "OK";
+}

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

@@ -0,0 +1,30 @@
+var global = 0;
+
+function test1() {
+    global++;
+    return global;
+}
+
+function test2() {
+    global++;
+    return global;
+}
+
+function test3() {
+    global++;
+    var $b = global--;
+    return $b + $b;
+}
+
+function box() {
+    var result = test1();
+    if (result != 1) return "fail1: " + result;
+
+    result = test2();
+    if (result != 2) return "fail2: " + result;
+
+    result = test3();
+    if (result != 6) return "fail3: " + result;
+
+    return "OK"
+}

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

@@ -0,0 +1,30 @@
+var global = 0;
+
+function test1() {
+    var $tmp = global++;
+    return global;
+}
+
+function test2() {
+    var $tmp;
+    $tmp = global++;
+    return global;
+}
+
+function test3() {
+    var $a = global++, $b = global--;
+    return $b + $b;
+}
+
+function box() {
+    var result = test1();
+    if (result != 1) return "fail1: " + result;
+
+    result = test2();
+    if (result != 2) return "fail2: " + result;
+
+    result = test3();
+    if (result != 6) return "fail3: " + result;
+
+    return "OK"
+}