Add check to see if stack pointer is off the stack according to the memory

src/processor/exploitability_unittest.cc

Index: src/processor/exploitability_unittest.cc
===================================================================
--- src/processor/exploitability_unittest.cc	(revision 1481)
+++ src/processor/exploitability_unittest.cc	(working copy)
@@ -127,6 +127,10 @@
             ExploitabilityFor("linux_inside_module_exe_region1.dmp"));
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING,
             ExploitabilityFor("linux_inside_module_exe_region2.dmp"));
+  ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING,
+            ExploitabilityFor("linux_stack_pointer_in_stack.dmp"));
+  ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
+            ExploitabilityFor("linux_stack_pointer_in_module.dmp"));
 
 }
 }