Move case conversion with ICU to 'staged'.

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index e130c62c0f3cc328e11fc3c5ec5188807df5a15d..8f2d7d1e5db1480b52d62c4c70063ae911292974 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -138,24 +138,6 @@
   'intl402/DateTimeFormat/12.1.1_1': [FAIL],
   'intl402/NumberFormat/11.1.1_1': [FAIL],
 
-  # https://code.google.com/p/v8/issues/detail?id=4476
-  # The bug is fixed but behind a flag, --icu_case_mapping.
-  'built-ins/String/prototype/toLowerCase/special_casing_conditional': [FAIL],
-  'built-ins/String/prototype/toLowerCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toUpperCase/supplementary_plane': [FAIL],
-
-  # https://code.google.com/p/v8/issues/detail?id=4477
-  # The bug is fixed but behind a flag, --icu_case_mapping.
-  'built-ins/String/prototype/toLocaleUpperCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toLocaleLowerCase/supplementary_plane': [FAIL],
-  'built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional': [FAIL],
-  '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],