Disable tracking of double fields during snapshot creation.

src/ia32/lithium-codegen-ia32.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 3249 matching lines @@
     Register result = ToRegister(instr->result());
     MemOperand operand = instr->object()->IsConstantOperand()
         ? MemOperand::StaticVariable(ToExternalReference(
                 LConstantOperand::cast(instr->object())))
         : MemOperand(ToRegister(instr->object()), offset);
     __ Load(result, operand, access.representation());
     return;
   }
 
   Register object = ToRegister(instr->object());
-  if (FLAG_track_double_fields &&
-      instr->hydrogen()->representation().IsDouble()) {
+  if (instr->hydrogen()->representation().IsDouble()) {
     if (CpuFeatures::IsSupported(SSE2)) {
       CpuFeatureScope scope(masm(), SSE2);
       XMMRegister result = ToDoubleRegister(instr->result());
       __ movsd(result, FieldOperand(object, offset));
     } else {
       X87Mov(ToX87Register(instr->result()), FieldOperand(object, offset));
     }
     return;
   }
 
@@ skipping 1103 matching lines @@
       if (IsInteger32(operand_value)) {
         DeoptimizeIf(no_condition, instr->environment());
       }
     } else {
       if (!instr->hydrogen()->value()->type().IsHeapObject()) {
         Register value = ToRegister(instr->value());
         __ test(value, Immediate(kSmiTagMask));
         DeoptimizeIf(zero, instr->environment());
       }
     }
-  } else if (FLAG_track_double_fields && representation.IsDouble()) {
+  } else if (representation.IsDouble()) {
     ASSERT(transition.is_null());
     ASSERT(access.IsInobject());
     ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
     if (CpuFeatures::IsSupported(SSE2)) {
       CpuFeatureScope scope(masm(), SSE2);
       XMMRegister value = ToDoubleRegister(instr->value());
       __ movsd(FieldOperand(object, offset), value);
     } else {
       X87Register value = ToX87Register(instr->value());
       X87Mov(FieldOperand(object, offset), value);
@@ skipping 1942 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32