[test] Skip slow test on no18n bot.

TBR=hablich@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1321063004

Cr-Commit-Position: refs/heads/master@{#30466}

test/mjsunit/mjsunit.status

@@ -323,6 +323,12 @@
   'for-in-opt': [PASS, FAIL],
 }],  # 'gc_stress == True'
 
+##############################################################################
+['no_i18n == True and mode == debug', {
+  # Tests too slow for no18n debug.
+  'regress/regress-1200351': [SKIP],
+}],  # 'no_i18n == True and mode == debug'
+
 ##############################################################################
 ['byteorder == big', {
   # Emscripten requires little-endian, skip all tests on big endian platforms.