[wasm] Add guard regions to end of WebAssembly.Memory buffers

test/mjsunit/mjsunit.status

 # 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 668 matching lines @@
   'ignition/*': [SKIP],
   'lithium/*': [SKIP],
   'third_party/*': [SKIP],
   'tools/*': [SKIP],
   'apply': [SKIP],
   'math-*': [SKIP],
   'unicode-test': [SKIP],
   'whitespaces': [SKIP],
 }],  # variant == asm_wasm
 
+['variant == wasm_traps', {
+  # Skip stuff uninteresting for wasm traps
+  'bugs/*': [SKIP],
+  'compiler/*': [SKIP],
+  'es6/*': [SKIP],
+  'es7/*': [SKIP],
+  'es8/*': [SKIP],
+  'harmony/*': [SKIP],
+  'ignition/*': [SKIP],
+  'lithium/*': [SKIP],
+  'third_party/*': [SKIP],
+  'tools/*': [SKIP],
+  'apply': [SKIP],
+  'math-*': [SKIP],
+  'unicode-test': [SKIP],
+  'whitespaces': [SKIP],
+}],  # variant == wasm_traps
+
 ]