[Interpreter] Skip a couple more flaky test262 tests on Ignition.

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

Review URL: https://codereview.chromium.org/1563163003

Cr-Commit-Position: refs/heads/master@{#33151}

test/test262/test262.status

@@ -752,6 +752,10 @@
   'built-ins/decodeURIComponent/S15.1.3.2_A1.2_T2': [SKIP],
   'built-ins/encodeURI*': [SKIP],
   'intl402/9.2.2': [SKIP],
+  'language/statements/let/fn-name-arrow': [SKIP],
+  'language/statements/let/fn-name-cover': [SKIP],
+  'language/statements/let/fn-name-fn': [SKIP],
+  'language/statements/let/fn-name-gen': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
 ]