Isolated emscripten in new lib

lib/emscripten/emtests/test_sizeof.cpp

@@ -0,0 +1,34 @@
+// Copyright 2016 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+#include <stdio.h>
+#include <string.h>
+#include "emscripten.h"
+
+struct A {
+  int x, y;
+};
+
+int main(int argc, const char *argv[]) {
+  int *a = new int[10];
+  int *b = new int[1];
+  int *c = new int[10];
+  for (int i = 0; i < 10; i++) a[i] = 2;
+  *b = 5;
+  for (int i = 0; i < 10; i++) c[i] = 8;
+  printf("*%d,%d,%d,%d,%d*\n", a[0], a[9], *b, c[0], c[9]);
+  // Should overwrite a, but not touch b!
+  memcpy(a, c, 10 * sizeof(int));
+  printf("*%d,%d,%d,%d,%d*\n", a[0], a[9], *b, c[0], c[9]);
+
+  // Part 2
+  A as[3] = {{5, 12}, {6, 990}, {7, 2}};
+  memcpy(&as[0], &as[2], sizeof(A));
+
+  printf("*%d,%d,%d,%d,%d,%d*\n", as[0].x, as[0].y, as[1].x, as[1].y, as[2].x,
+         as[2].y);
+
+  return 0;
+}