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

tools/testrunner/local/variants.py

Index: tools/testrunner/local/variants.py
diff --git a/tools/testrunner/local/variants.py b/tools/testrunner/local/variants.py
index ea42bf52480522151a0369862be66e3eed8ae6e6..7c03f120a3aeb36c2b7677c3bf68f9b493672d8c 100644
--- a/tools/testrunner/local/variants.py
+++ b/tools/testrunner/local/variants.py
@@ -14,6 +14,7 @@ ALL_VARIANT_FLAGS = {
   "ignition_turbofan": [["--ignition-staging", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
   "asm_wasm": [["--validate-asm"]],
+  "wasm_traps": [["--wasm_guard_pages", "--invoke-weak-callbacks"]],
 }
 
 # FAST_VARIANTS implies no --always-opt.
@@ -27,8 +28,9 @@ FAST_VARIANT_FLAGS = {
   "ignition_turbofan": [["--ignition-staging", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
   "asm_wasm": [["--validate-asm"]],
+  "wasm_traps": [["--wasm_guard_pages", "--invoke-weak-callbacks"]],
 }
 
 ALL_VARIANTS = set(["default", "stress", "turbofan", "turbofan_opt",
                     "nocrankshaft", "ignition", "ignition_staging",
-                    "ignition_turbofan", "preparser", "asm_wasm"])
+                    "ignition_turbofan", "preparser", "asm_wasm", "wasm_traps"])