Use a regular ICU API for el-Upper

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #     * Redistributions of source code must retain the above copyright
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@@ skipping 284 matching lines @@
   'built-ins/Function/prototype/toString/line-terminator-normalisation-LF': [FAIL],
   'built-ins/Function/prototype/toString/method-class': [FAIL],
   'built-ins/Function/prototype/toString/method-class-static': [FAIL],
   'built-ins/Function/prototype/toString/method-computed-property-name': [FAIL],
   'built-ins/Function/prototype/toString/method-object': [FAIL],
   'built-ins/Function/prototype/toString/setter-class': [FAIL],
   'built-ins/Function/prototype/toString/setter-class-static': [FAIL],
   'built-ins/Function/prototype/toString/setter-object': [FAIL],
   'built-ins/Function/prototype/toString/unicode': [FAIL],
 
-  # https://bugs.chromium.org/p/v8/issues/detail?id=5012
-  # http://bugs.icu-project.org/trac/ticket/12671
-  'intl402/Intl/getCanonicalLocales/weird-cases': [FAIL],
   # https://github.com/tc39/test262/issues/743
   'intl402/Intl/getCanonicalLocales/main': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5115
   'language/statements/class/subclass/class-definition-null-proto-missing-return-override': [FAIL],
   'language/statements/class/subclass/class-definition-null-proto-this': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5116
   'built-ins/Object/internals/DefineOwnProperty/nan-equivalence': [PASS, FAIL],
   'built-ins/TypedArray/prototype/fill/fill-values-conversion-operations-consistent-nan': [PASS, FAIL],
@@ skipping 301 matching lines @@
 
   # v8:5487
   'language/module-code/namespace/internals/get-own-property-str-found-uninit': [FAIL],
 
   # v8:5401
   'language/module-code/namespace/internals/set': [FAIL],
   'language/module-code/namespace/internals/define-own-property': [FAIL],
 }],  # variant == ignition or variant == ignition_staging or variant == ignition_turbofan
 
 ]