[Turbofan] Fix a race on CallInterfaceDescriptor initialization.

src/interface-descriptors.h

 // Copyright 2014 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.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
 
@@ skipping 198 matching lines @@
       Isolate* isolate, int register_param_count) {
     return BuildDefaultFunctionType(isolate, register_param_count);
   }
 
   virtual void InitializePlatformSpecific(CallInterfaceDescriptorData* data) {
     UNREACHABLE();
   }
 
   void Initialize(Isolate* isolate, CallDescriptors::Key key) {
     if (!data()->IsInitialized()) {
+      // We should only initialize descriptors on the isolate's main thread.
+      DCHECK(ThreadId::Current().Equals(isolate->thread_id()));
       CallInterfaceDescriptorData* d = isolate->call_descriptor_data(key);
       DCHECK(d == data());  // d should be a modifiable pointer to data().
       InitializePlatformSpecific(d);
       FunctionType* function_type = BuildCallInterfaceDescriptorFunctionType(
           isolate, d->register_param_count());
       d->InitializePlatformIndependent(function_type);
     }
   }
 
   // Initializes |data| using the platform dependent default set of registers.
@@ skipping 703 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_