[test] Mark test as failing on arm.

BUG=v8:4459
LOG=n
NOTRY=true
NOTREECHECKS=true
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1384663004

Cr-Commit-Position: refs/heads/master@{#31077}

test/intl/intl.status

@@ -47,4 +47,10 @@
   # BUG(v8:4459).
   'collator/default-locale': [FAIL],
 }],  # 'system == macos'
+
+##############################################################################
+['arch == arm or arch == arm64', {
+  # BUG(v8:4459).
+  'collator/default-locale': [PASS, FAIL],
+}],  # 'arch == arm64'
 ]