[stubs] Enable machine graph verification for CodeStubAssembler and friends by default in debug mode

src/fast-accessor-assembler.cc

 // Copyright 2015 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/fast-accessor-assembler.h"
 
 #include "src/base/logging.h"
 #include "src/code-stub-assembler.h"
 #include "src/code-stubs.h"  // For CallApiCallbackStub.
 #include "src/handles-inl.h"
@@ skipping 222 matching lines @@
                                                  Internals::kJSApiObjectType)),
       FromId(label_id));
 
   // Continue.
   assembler_->Goto(&is_jsobject);
   assembler_->Bind(&is_jsobject);
 }
 
 MaybeHandle<Code> FastAccessorAssembler::Build() {
   CHECK_EQ(kBuilding, state_);
-  Handle<Code> code = compiler::CodeAssembler::GenerateCode(
-      assembler_state_.get(), FLAG_csa_verify);
+  Handle<Code> code =
+      compiler::CodeAssembler::GenerateCode(assembler_state_.get());
   state_ = !code.is_null() ? kBuilt : kError;
   Clear();
   return code;
 }
 
 FastAccessorAssembler::ValueId FastAccessorAssembler::FromRaw(Node* node) {
   nodes_.push_back(node);
   ValueId value_id = {nodes_.size() - 1};
   return value_id;
 }
@@ skipping 20 matching lines @@
 void FastAccessorAssembler::Clear() {
   for (auto label : labels_) {
     delete label;
   }
   nodes_.clear();
   labels_.clear();
 }
 
 }  // namespace internal
 }  // namespace v8