Made the detailed reason for deopts mandatory on ia32. Unified and improved things.

src/ia32/macro-assembler-ia32.h

 // Copyright 2012 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_IA32_MACRO_ASSEMBLER_IA32_H_
 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_
 
 #include "src/assembler.h"
 #include "src/frames.h"
 #include "src/globals.h"
@@ skipping 445 matching lines @@
                           XMMRegister scratch_reg,
                           Register result_reg);
 
   void SlowTruncateToI(Register result_reg, Register input_reg,
       int offset = HeapNumber::kValueOffset - kHeapObjectTag);
 
   void TruncateHeapNumberToI(Register result_reg, Register input_reg);
   void TruncateDoubleToI(Register result_reg, XMMRegister input_reg);
 
   void DoubleToI(Register result_reg, XMMRegister input_reg,
-      XMMRegister scratch, MinusZeroMode minus_zero_mode,
-      Label* conversion_failed, Label::Distance dst = Label::kFar);
+                 XMMRegister scratch, MinusZeroMode minus_zero_mode,
+                 Label* lost_precision, Label* is_nan, Label* minus_zero,
+                 Label::Distance dst = Label::kFar);
 
   // Smi tagging support.
   void SmiTag(Register reg) {
     STATIC_ASSERT(kSmiTag == 0);
     STATIC_ASSERT(kSmiTagSize == 1);
     add(reg, reg);
   }
   void SmiUntag(Register reg) {
     sar(reg, kSmiTagSize);
   }
@@ skipping 624 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_