[builtins] Simplify String constructor code.

src/arm64/macro-assembler-arm64.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_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/arm64/assembler-arm64.h"
@@ skipping 966 matching lines @@
   // Sets the vs flag if the input is -0.0.
   void TestForMinusZero(DoubleRegister input);
 
   // Jump to label if the input double register contains -0.0.
   void JumpIfMinusZero(DoubleRegister input, Label* on_negative_zero);
 
   // Jump to label if the input integer register contains the double precision
   // floating point representation of -0.0.
   void JumpIfMinusZero(Register input, Label* on_negative_zero);
 
-  // Generate code to do a lookup in the number string cache. If the number in
-  // the register object is found in the cache the generated code falls through
-  // with the result in the result register. The object and the result register
-  // can be the same. If the number is not found in the cache the code jumps to
-  // the label not_found with only the content of register object unchanged.
-  void LookupNumberStringCache(Register object,
-                               Register result,
-                               Register scratch1,
-                               Register scratch2,
-                               Register scratch3,
-                               Label* not_found);
-
   // Saturate a signed 32-bit integer in input to an unsigned 8-bit integer in
   // output.
   void ClampInt32ToUint8(Register in_out);
   void ClampInt32ToUint8(Register output, Register input);
 
   // Saturate a double in input to an unsigned 8-bit integer in output.
   void ClampDoubleToUint8(Register output,
                           DoubleRegister input,
                           DoubleRegister dbl_scratch);
 
@@ skipping 1284 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_