Increase acceptable boot up memory size in tests for parallel sweeper threads.

test/cctest/test-mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 540 matching lines @@
   FLAG_parallel_recompilation = false;
 
   // Only Linux has the proc filesystem and only if it is mapped.  If it's not
   // there we just skip the test.
   if (initial_memory >= 0) {
     InitializeVM();
     intptr_t delta = MemoryInUse() - initial_memory;
     printf("delta: %" V8_PTR_PREFIX "d kB\n", delta / 1024);
     if (sizeof(initial_memory) == 8) {  // 64-bit.
       if (v8::internal::Snapshot::IsEnabled()) {
-        CHECK_LE(delta, 3700 * 1024);
+        CHECK_LE(delta, 4000 * 1024);
       } else {
-        CHECK_LE(delta, 4200 * 1024);
+        CHECK_LE(delta, 4500 * 1024);
       }
     } else {                            // 32-bit.
       if (v8::internal::Snapshot::IsEnabled()) {
-        CHECK_LE(delta, 2600 * 1024);
+        CHECK_LE(delta, 2900 * 1024);
       } else {
-        CHECK_LE(delta, 3100 * 1024);
+        CHECK_LE(delta, 3400 * 1024);
       }
     }
   }
 }
 
 #endif  // __linux__ and !USE_SIMULATOR