Shorten FP register pops where possible.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2011 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 3738 matching lines @@
       // Load x87 register with heap number.
       __ fld_d(FieldOperand(input_reg, HeapNumber::kValueOffset));
       // Get exponent alone and check for too-big exponent.
       __ mov(input_reg, FieldOperand(input_reg, HeapNumber::kExponentOffset));
       __ and_(input_reg, HeapNumber::kExponentMask);
       const uint32_t kTooBigExponent =
           (HeapNumber::kExponentBias + 63) << HeapNumber::kExponentShift;
       __ cmp(Operand(input_reg), Immediate(kTooBigExponent));
       __ j(less, &convert, Label::kNear);
       // Pop FPU stack before deoptimizing.
-      __ ffree(0);
-      __ fincstp();
+      __ fstp(0);
       DeoptimizeIf(no_condition, instr->environment());
 
       // Reserve space for 64 bit answer.
       __ bind(&convert);
       __ sub(Operand(esp), Immediate(kDoubleSize));
       // Do conversion, which cannot fail because we checked the exponent.
       __ fisttp_d(Operand(esp, 0));
       __ mov(input_reg, Operand(esp, 0));  // Low word of answer is the result.
       __ add(Operand(esp), Immediate(kDoubleSize));
     } else {
@@ skipping 861 matching lines @@
       this, pointers, Safepoint::kLazyDeopt);
   __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION, safepoint_generator);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32