[Ignition] Skip crashing test on arm64.

Crashes after https://codereview.chromium.org/1667673003

BUG=v8:4280
LOG=N
NOTRY=true
TBR=rmcilroy@chromium.org

Review URL: https://codereview.chromium.org/1669783002

Cr-Commit-Position: refs/heads/master@{#33727}

test/cctest/cctest.status

@@ -726,6 +726,7 @@
 
 ['ignition == True and arch == arm64', {
   # TODO(rmcilroy,4680): Arm64 specific crashes.
+  'test-api/ExternalWrap': [SKIP],
   'test-heap/NoWeakHashTableLeakWithIncrementalMarking': [SKIP],
 
   # TODO(rmcilroy,4680): Arm64 flakes.
@@ -734,7 +735,6 @@
   'test-api/InitializeDefaultIsolateOnSecondaryThread1': [PASS, FAIL],
   'test-heap/Regress538257': [PASS, FAIL],
   'test-heap/AddInstructionChangesNewSpacePromotion': [PASS, FAIL],
-  'test-api/ExternalWrap': [PASS, FAIL],
   'test-decls/CrossScriptReferencesHarmony': [PASS, FAIL],
   'test-lockers/IsolateNestedLocking': [PASS, FAIL],
 }],  # ignition == True and arch == arm64