[refactor] Separate generated builtins and C++ builtins into separate files

src/builtins/builtins-symbol.cc

 // Copyright 2016 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.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
-#include "src/code-stub-assembler.h"
 #include "src/counters.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
 // ES6 section 19.4 Symbol Objects
 
 // ES6 section 19.4.1.1 Symbol ( [ description ] ) for the [[Call]] case.
@@ skipping 42 matching lines @@
     result = symbol->name();
     DCHECK(result->IsString());
   } else {
     result = isolate->heap()->undefined_value();
   }
   DCHECK_EQ(isolate->heap()->public_symbol_table()->SlowReverseLookup(*symbol),
             result);
   return result;
 }
 
-// ES6 section 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint )
-TF_BUILTIN(SymbolPrototypeToPrimitive, CodeStubAssembler) {
-  Node* receiver = Parameter(0);
-  Node* context = Parameter(4);
-
-  Node* result = ToThisValue(context, receiver, PrimitiveType::kSymbol,
-                             "Symbol.prototype [ @@toPrimitive ]");
-  Return(result);
-}
-
-// ES6 section 19.4.3.2 Symbol.prototype.toString ( )
-TF_BUILTIN(SymbolPrototypeToString, CodeStubAssembler) {
-  Node* receiver = Parameter(0);
-  Node* context = Parameter(3);
-
-  Node* value = ToThisValue(context, receiver, PrimitiveType::kSymbol,
-                            "Symbol.prototype.toString");
-  Node* result = CallRuntime(Runtime::kSymbolDescriptiveString, context, value);
-  Return(result);
-}
-
-// ES6 section 19.4.3.3 Symbol.prototype.valueOf ( )
-TF_BUILTIN(SymbolPrototypeValueOf, CodeStubAssembler) {
-  Node* receiver = Parameter(0);
-  Node* context = Parameter(3);
-
-  Node* result = ToThisValue(context, receiver, PrimitiveType::kSymbol,
-                             "Symbol.prototype.valueOf");
-  Return(result);
-}
-
 }  // namespace internal
 }  // namespace v8