Test cases of resolved issues (#2614)

Summary:
Release Notes: None

Went through optimized functions issues looking for ones that have already been resolved and not closed. These were the only ones I found that didn't have a corresponding PR adding a test case linked from the issue.
Pull Request resolved: https://github.com/facebook/prepack/pull/2614

Differential Revision: D10516188

Pulled By: cblappert

fbshipit-source-id: aaf23d3aa857cc495b804fb1e05c2cb4955fd85f

test/serializer/optimized-functions/Issue1640ImplicitThis.js

@@ -0,0 +1,16 @@
+(function() {
+  function f(x) {
+    this.x = 5 + x;
+    var self = this;
+    this.doSomething = function(y) {
+      return self.x + y;
+    };
+  }
+
+  if (global.__optimize) __optimize(f);
+
+  global.inspect = function() {
+    var obj = new f(10);
+    return obj.doSomething(20);
+  };
+})();

test/serializer/optimized-functions/Issue2388.js

@@ -0,0 +1,26 @@
+var foo;
+(function() {
+  function f() {
+    let x = 23;
+    function g() {
+      x = x + 1;
+      // x doesn't leak here
+    }
+    function h(gg) {
+      function hh() {
+        x = x + 1;
+      }
+      gg(hh); // leaks x
+    }
+    global.__optimize && __optimize(g);
+    global.__optimize && __optimize(h);
+    return [g, h];
+  }
+  global.__optimize && __optimize(f);
+  foo = f;
+})();
+
+global.inspect = function() {
+  let [g, h] = foo();
+  return h(g);
+};