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

src/builtins/builtins-symbol.cc

Index: src/builtins/builtins-symbol.cc
diff --git a/src/builtins/builtins-symbol.cc b/src/builtins/builtins-symbol.cc
index 43cb8c89a90a29c44526c332bb9b5ff2aea60cb2..77bb09d0f764f033fc06845022d5c534f5eac75f 100644
--- a/src/builtins/builtins-symbol.cc
+++ b/src/builtins/builtins-symbol.cc
@@ -4,7 +4,6 @@
 
 #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"
 
@@ -67,36 +66,5 @@ BUILTIN(SymbolKeyFor) {
   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