[string] Move String.p.toLowerCase to CSA

src/intl.h

 // Copyright 2013 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_INTL_SUPPORT
 #error Internationalization is expected to be enabled.
 #endif  // V8_INTL_SUPPORT
 
 #ifndef V8_INTL_H_
 #define V8_INTL_H_
@@ skipping 12 matching lines @@
 const UChar* GetUCharBufferFromFlat(const String::FlatContent& flat,
                                     std::unique_ptr<uc16[]>* dest,
                                     int32_t length);
 MUST_USE_RESULT Object* LocaleConvertCase(Handle<String> s, Isolate* isolate,
                                           bool is_to_upper, const char* lang);
 MUST_USE_RESULT Object* ConvertToLower(Handle<String> s, Isolate* isolate);
 MUST_USE_RESULT Object* ConvertToUpper(Handle<String> s, Isolate* isolate);
 MUST_USE_RESULT Object* ConvertCase(Handle<String> s, bool is_upper,
                                     Isolate* isolate);
 
+MUST_USE_RESULT Object* ConvertOneByteToLower(String* src, String* dst,
+                                              Isolate* isolate);
+
+const uint8_t* ToLatin1LowerTable();
+
 // ICUTimezoneCache calls out to ICU for TimezoneCache
 // functionality in a straightforward way.
 class ICUTimezoneCache : public base::TimezoneCache {
  public:
   ICUTimezoneCache();
 
   ~ICUTimezoneCache() override;
 
   const char* LocalTimezone(double time_ms) override;
 
@@ skipping 12 matching lines @@
 
   static const int32_t kMaxTimezoneChars = 100;
   char timezone_name_[kMaxTimezoneChars];
   char dst_timezone_name_[kMaxTimezoneChars];
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTL_H_