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

src/runtime/runtime.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/base/platform/time.h"
 #include "src/objects.h"
@@ skipping 241 matching lines @@
   F(InternalNumberFormat, 2, 1)              \
   F(InternalNumberParse, 2, 1)               \
   F(CreateCollator, 3, 1)                    \
   F(InternalCompare, 3, 1)                   \
   F(StringNormalize, 2, 1)                   \
   F(CreateBreakIterator, 3, 1)               \
   F(BreakIteratorAdoptText, 2, 1)            \
   F(BreakIteratorFirst, 1, 1)                \
   F(BreakIteratorNext, 1, 1)                 \
   F(BreakIteratorCurrent, 1, 1)              \
-  F(BreakIteratorBreakType, 1, 1)
+  F(BreakIteratorBreakType, 1, 1)            \
+  F(StringToLowerCaseI18N, 1, 1)             \
+  F(StringToUpperCaseI18N, 1, 1)             \
+  F(StringLocaleConvertCase, 3, 1)
 #else
 #define FOR_EACH_INTRINSIC_I18N(F)
 #endif
 
 #define FOR_EACH_INTRINSIC_INTERNAL(F)              \
   F(CheckIsBootstrapping, 0, 1)                     \
   F(ExportFromRuntime, 1, 1)                        \
   F(ExportExperimentalFromRuntime, 1, 1)            \
   F(InstallToContext, 1, 1)                         \
   F(Throw, 1, 1)                                    \
@@ skipping 889 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_