[ia32] Fixes a bug in cmpw.

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 6ebda4d767c0e68651c03e8fa3dff34aa4a79fa2..925ae48c5e8659b3a619a51d1eab16420219c15a 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -852,14 +852,14 @@ void Assembler::cmpw(const Operand& op, Immediate imm16) {
 void Assembler::cmpw(Register reg, const Operand& op) {
   EnsureSpace ensure_space(this);
   EMIT(0x66);
-  EMIT(0x39);
+  EMIT(0x3B);
   emit_operand(reg, op);
 }
 
 void Assembler::cmpw(const Operand& op, Register reg) {
   EnsureSpace ensure_space(this);
   EMIT(0x66);
-  EMIT(0x3B);
+  EMIT(0x39);
   emit_operand(reg, op);
 }