Fix cmpctmalloc for large allocations

src/freertos/cmpctmalloc_test.cc

 // Copyright (c) 2016, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 #include <stdio.h>
 #include <cinttypes>
 
 #include "src/freertos/cmpctmalloc.h"
 #include "src/freertos/page_alloc.h"
 #include "src/freertos/page_allocator.h"
@@ skipping 27 matching lines @@
   size_t heap_size = 60 * PAGE_SIZE;  // TODO(sgjesse): Test with few pages.
   heap_size = 0x800000;
   void* heap_memory;
   int result = posix_memalign(&heap_memory, PAGE_SIZE, heap_size);
   EXPECT_EQ(0, result);
   int arena1_bitmap = page_allocator->AddArena(
       "test", reinterpret_cast<uintptr_t>(heap_memory), heap_size);
   EXPECT_EQ(1, arena1_bitmap);
 
   cmpct_test_buckets();
-  // TODO(534): This test crashes.
-  // cmpct_test_get_back_newly_freed();
+  cmpct_test_get_back_newly_freed();
   cmpct_test_return_to_os();
   cmpct_test_trim();
   cmpct_dump();
 }