[stubs] Fixing issues found by machine graph verifier in code stubs.

src/builtins/builtins.cc

 // Copyright 2012 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.h"
 #include "src/code-events.h"
 #include "src/compiler/code-assembler.h"
 #include "src/ic/ic-state.h"
 #include "src/interface-descriptors.h"
 #include "src/isolate.h"
@@ skipping 90 matching lines @@
                                    Code::Flags flags, const char* name) {
   HandleScope scope(isolate);
   Zone zone(isolate->allocator(), ZONE_NAME);
   // The interface descriptor with given key must be initialized at this point
   // and this construction just queries the details from the descriptors table.
   CallInterfaceDescriptor descriptor(isolate, interface_descriptor);
   // Ensure descriptor is already initialized.
   DCHECK_LE(0, descriptor.GetRegisterParameterCount());
   compiler::CodeAssemblerState state(isolate, &zone, descriptor, flags, name);
   generator(&state);
+
+  // TODO(ishell): remove this when code stub assembler graphs verification
+  // is enabled for all stubs.
+  bool saved_csa_verify = FLAG_csa_verify;
+  // Enable verification only in mksnapshot.
+  FLAG_csa_verify = DEBUG_BOOL && FLAG_startup_blob != nullptr;
   Handle<Code> code = compiler::CodeAssembler::GenerateCode(&state);
+  FLAG_csa_verify = saved_csa_verify;
   PostBuildProfileAndTracing(isolate, *code, name);
   return *code;
 }
 }  // anonymous namespace
 
 void Builtins::SetUp(Isolate* isolate, bool create_heap_objects) {
   DCHECK(!initialized_);
 
   // Create a scope for the handles in the builtins.
   HandleScope scope(isolate);
@@ skipping 167 matching lines @@
   // TODO(jochen): Remove this.
   if (responsible_context.is_null()) {
     return true;
   }
   if (*responsible_context == target->context()) return true;
   return isolate->MayAccess(responsible_context, target_global_proxy);
 }
 
 }  // namespace internal
 }  // namespace v8