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

src/isolate.cc

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2138 matching lines @@
     // deopt entry table that might have been referred to by optimized code in
     // the snapshot.
     HandleScope scope(this);
     Deoptimizer::EnsureCodeForDeoptimizationEntry(
         this,
         Deoptimizer::LAZY,
         kDeoptTableSerializeEntryCount - 1);
   }
 
   if (!Serializer::enabled()) {
     // Ensure that the stub failure trampoline has been generated.

[Michael Starzinger, 2013/03/06 16:01:04]

The comment is outdated, this ensures that all stubs which need to be generated
ahead of time, but cannot be serialized into the snapshot have been generated.

     HandleScope scope(this);
+    StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(this);
     CodeStub::GenerateFPStubs(this);
     StubFailureTrampolineStub::GenerateAheadOfTime(this);
   }
 
   if (FLAG_parallel_recompilation) optimizing_compiler_thread_.Start();
 
   if (FLAG_parallel_marking && FLAG_marking_threads == 0) {
     FLAG_marking_threads = SystemThreadManager::
         NumberOfParallelSystemThreads(
             SystemThreadManager::PARALLEL_MARKING);
@@ skipping 167 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal