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

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index a91b0c44a5a4130a2bbf16ddf4386ddba88a6fd7..9e830c06abb80d8f6be99de6755b1a191953a52d 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -32,7 +32,7 @@
 
 // The original source code covered by the above license above has been modified
 // significantly by Google Inc.
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 
 #include "v8.h"
 
@@ -2246,6 +2246,15 @@ void Assembler::xorpd(XMMRegister dst, XMMRegister src) {
 }
 
 
+void Assembler::xorps(XMMRegister dst, XMMRegister src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  EMIT(0x0F);
+  EMIT(0x57);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::sqrtsd(XMMRegister dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;