The memory size test makes no sense on the simulated platforms.

test/cctest/test-mark-compact.cc

Index: test/cctest/test-mark-compact.cc
===================================================================
--- test/cctest/test-mark-compact.cc	(revision 10171)
+++ test/cctest/test-mark-compact.cc	(working copy)
@@ -454,7 +454,10 @@
 }
 
 
-#ifdef __linux__
+// Here is a memory use test that uses /proc, and is therefore Linux-only.  We
+// do not care how much memory the simulator uses, since it is only there for
+// debugging purposes.
+#if defined(__linux__) && !defined(USE_SIMULATOR)
 
 
 static uintptr_t ReadLong(char* buffer, intptr_t* position, int base) {
@@ -532,4 +535,4 @@
   }
 }
 
-#endif  // __linux__
+#endif  // __linux__ and !USE_SIMULATOR