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

src/builtins/builtins-wasm-gen.cc

 // Copyright 2017 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-utils-gen.h"
 #include "src/code-stub-assembler.h"
 #include "src/objects-inl.h"
 #include "src/wasm/wasm-opcodes.h"
 
 namespace v8 {
 namespace internal {
 
 typedef compiler::Node Node;
 
 TF_BUILTIN(WasmStackGuard, CodeStubAssembler) {
   Node* context = SmiConstant(Smi::kZero);
   TailCallRuntime(Runtime::kWasmStackGuard, context);
 }
 
 #define DECLARE_ENUM(name)                                                    \
   TF_BUILTIN(ThrowWasm##name, CodeStubAssembler) {                            \
     int message_id = wasm::WasmOpcodes::TrapReasonToMessageId(wasm::k##name); \
     TailCallRuntime(Runtime::kThrowWasmErrorFromTrapIf,                       \
                     SmiConstant(Smi::kZero), SmiConstant(message_id));        \
   }
 FOREACH_WASM_TRAPREASON(DECLARE_ENUM)
 #undef DECLARE_ENUM
 
 }  // namespace internal
 }  // namespace v8