Change codegen for literals to emit xor when literal is zero.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index d64f528e71c9a6d92221b2741df9c5cf4f82f7dd..2d5cd0f197d5982cf208bf5649ee9c3cb301ab26 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -940,7 +940,7 @@ void LCodeGen::DoSubI(LSubI* instr) {
 
 void LCodeGen::DoConstantI(LConstantI* instr) {
   ASSERT(instr->result()->IsRegister());
-  __ mov(ToRegister(instr->result()), instr->value());
+  __ Set(ToRegister(instr->result()), Immediate(instr->value()));
 }
 
 
@@ -973,7 +973,7 @@ void LCodeGen::DoConstantD(LConstantD* instr) {
 
 void LCodeGen::DoConstantT(LConstantT* instr) {
   ASSERT(instr->result()->IsRegister());
-  __ mov(ToRegister(instr->result()), Immediate(instr->value()));
+  __ Set(ToRegister(instr->result()), Immediate(instr->value()));
 }