Make sure that on x86 we don't generate SSE2 code in the snapshot.

src/assembler.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 168 matching lines @@
   assembler_->set_predictable_code_size(old_value_);
 }
 
 
 // -----------------------------------------------------------------------------
 // Implementation of CpuFeatureScope
 
 #ifdef DEBUG
 CpuFeatureScope::CpuFeatureScope(AssemblerBase* assembler, CpuFeature f)
     : assembler_(assembler) {
-  ASSERT(CpuFeatures::IsSupported(f));
-  ASSERT(!Serializer::enabled() ||
-         !CpuFeatures::IsFoundByRuntimeProbingOnly(f));
+  ASSERT(CpuFeatures::IsSafeForSnapshot(f));
   old_enabled_ = assembler_->enabled_cpu_features();
   uint64_t mask = static_cast<uint64_t>(1) << f;
   // TODO(svenpanne) This special case below doesn't belong here!
 #if V8_TARGET_ARCH_ARM
   // VFP2 and ARMv7 are implied by VFP3.
   if (f == VFP3) {
     mask |=
         static_cast<uint64_t>(1) << VFP2 |
         static_cast<uint64_t>(1) << ARMv7;
   }
@@ skipping 1437 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal