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

test/mozilla/mozilla.status

Index: test/mozilla/mozilla.status
diff --git a/test/mozilla/mozilla.status b/test/mozilla/mozilla.status
index d5b967408be230c5f991465b40bdf997da2da6e6..f8b215e862bb60ad53173393ccf153ac6f04e6c6 100644
--- a/test/mozilla/mozilla.status
+++ b/test/mozilla/mozilla.status
@@ -999,4 +999,8 @@
   '*': [SKIP],
 }],  # variant == asm_wasm
 
+['variant == wasm_traps', {
+  '*': [SKIP],
+}],  # variant == wasm_traps
+
 ]