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

src/builtins/builtins-wasm.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/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