Cleanup: use xorps to zero out an xmm register on ia32 too.

src/ia32/assembler-ia32.h

 // 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 934 matching lines @@
 
   void cvtsi2sd(XMMRegister dst, const Operand& src);
   void cvtss2sd(XMMRegister dst, XMMRegister src);
   void cvtsd2ss(XMMRegister dst, XMMRegister src);
 
   void addsd(XMMRegister dst, XMMRegister src);
   void subsd(XMMRegister dst, XMMRegister src);
   void mulsd(XMMRegister dst, XMMRegister src);
   void divsd(XMMRegister dst, XMMRegister src);
   void xorpd(XMMRegister dst, XMMRegister src);
+  void xorps(XMMRegister dst, XMMRegister src);
   void sqrtsd(XMMRegister dst, XMMRegister src);
 
   void andpd(XMMRegister dst, XMMRegister src);
 
   void ucomisd(XMMRegister dst, XMMRegister src);
   void movmskpd(Register dst, XMMRegister src);
 
   void cmpltsd(XMMRegister dst, XMMRegister src);
 
   void movaps(XMMRegister dst, XMMRegister src);
@@ skipping 189 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_