Serializer enable/disable flags need thread safety.

src/mips/assembler-mips.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 87 matching lines @@
     "f24",
     "f26"
   };
   return names[index];
 }
 
 
 void CpuFeatures::Probe() {
   unsigned standard_features = (OS::CpuFeaturesImpliedByPlatform() |
                                 CpuFeaturesImpliedByCompiler());
-  ASSERT(supported_ == 0 || supported_ == standard_features);
+  ASSERT(supported_ == 0 ||
+         (supported_ & standard_features) == standard_features);
 #ifdef DEBUG
   initialized_ = true;
 #endif
 
   // Get the features implied by the OS and the compiler settings. This is the
   // minimal set of features which is also allowed for generated code in the
   // snapshot.
   supported_ |= standard_features;
 
   if (Serializer::enabled()) {
@@ skipping 2223 matching lines @@
 void Assembler::PopulateConstantPool(ConstantPoolArray* constant_pool) {
   // No out-of-line constant pool support.
   ASSERT(!FLAG_enable_ool_constant_pool);
   return;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS