Add check for executable stack/heap when rating Linux exploitability.

src/processor/exploitability_unittest.cc

Index: src/processor/exploitability_unittest.cc
===================================================================
--- src/processor/exploitability_unittest.cc	(revision 1487)
+++ src/processor/exploitability_unittest.cc	(working copy)
@@ -131,6 +131,10 @@
             ExploitabilityFor("linux_stack_pointer_in_stack.dmp"));
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
             ExploitabilityFor("linux_stack_pointer_in_module.dmp"));
+  ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
+            ExploitabilityFor("linux_executable_stack.dmp"));
+  ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
+            ExploitabilityFor("linux_executable_heap.dmp"));
 
 }
 }