Use ICU case conversion/transliterator for case conversion behind a flag

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index 8cd4496d807df3e753e00b2de81b51d0e10abfa9..2cd1293ef798a324f0f20c413d41b498b88096e0 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -142,22 +142,6 @@
   'intl402/DateTimeFormat/12.1.1_1': [FAIL],
   'intl402/NumberFormat/11.1.1_1': [FAIL],
 
-  # https://code.google.com/p/v8/issues/detail?id=4476
-  'built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional': [FAIL],
-  'built-ins/String/prototype/toLocaleLowerCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toLowerCase/special_casing_conditional': [FAIL],
-  'built-ins/String/prototype/toLowerCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toLocaleUpperCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toUpperCase/supplementary_plane': [FAIL],
-
-  # https://code.google.com/p/v8/issues/detail?id=4477
-  'intl402/String/prototype/toLocaleLowerCase/special_casing_Azeri': [FAIL],
-  'intl402/String/prototype/toLocaleLowerCase/special_casing_Lithuanian': [FAIL],
-  'intl402/String/prototype/toLocaleLowerCase/special_casing_Turkish': [FAIL],
-  'intl402/String/prototype/toLocaleUpperCase/special_casing_Azeri': [FAIL],
-  'intl402/String/prototype/toLocaleUpperCase/special_casing_Lithuanian': [FAIL],
-  'intl402/String/prototype/toLocaleUpperCase/special_casing_Turkish': [FAIL],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=4628
   'language/eval-code/non-definable-function-with-variable': [FAIL],
   'language/eval-code/non-definable-function-with-function': [FAIL],
@@ -323,6 +307,22 @@
   'built-ins/String/prototype/normalize/return-normalized-string': [SKIP],
   'built-ins/String/prototype/normalize/return-normalized-string-from-coerced-form': [SKIP],
   'built-ins/String/prototype/normalize/return-normalized-string-using-default-parameter': [SKIP],
+
+  # Case-conversion is not fully compliant to the Unicode spec with i18n off.
+  'built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional': [FAIL],
+  'built-ins/String/prototype/toLocaleLowerCase/supplementary_plane': [FAIL],
+  'built-ins/String/prototype/toLowerCase/special_casing_conditional': [FAIL],
+  'built-ins/String/prototype/toLowerCase/supplementary_plane': [FAIL],
+  'built-ins/String/prototype/toLocaleUpperCase/supplementary_plane': [FAIL],
+  'built-ins/String/prototype/toUpperCase/supplementary_plane': [FAIL],
+
+  # Locale-sensitive case-conversion is not available with i18n off.
+  'intl402/String/prototype/toLocaleLowerCase/special_casing_Azeri': [FAIL],
+  'intl402/String/prototype/toLocaleLowerCase/special_casing_Lithuanian': [FAIL],
+  'intl402/String/prototype/toLocaleLowerCase/special_casing_Turkish': [FAIL],
+  'intl402/String/prototype/toLocaleUpperCase/special_casing_Azeri': [FAIL],
+  'intl402/String/prototype/toLocaleUpperCase/special_casing_Lithuanian': [FAIL],
+  'intl402/String/prototype/toLocaleUpperCase/special_casing_Turkish': [FAIL],
 }],  # no_i18n == True