[ia32] Fix invalid DCHECK on cmpw with immediate.

src/ia32/assembler-ia32.cc

 // 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 823 matching lines @@
 
 void Assembler::cmpb(Register reg, const Operand& op) {
   CHECK(reg.is_byte_register());
   EnsureSpace ensure_space(this);
   EMIT(0x3A);
   emit_operand(reg, op);
 }
 
 
 void Assembler::cmpw(const Operand& op, Immediate imm16) {
-  DCHECK(imm16.is_int16());
+  DCHECK(imm16.is_int16() || imm16.is_uint16());
   EnsureSpace ensure_space(this);
   EMIT(0x66);
   EMIT(0x81);
   emit_operand(edi, op);
   emit_w(imm16);
 }
 
 void Assembler::cmpw(Register reg, const Operand& op) {
   EnsureSpace ensure_space(this);
   EMIT(0x66);
@@ skipping 2215 matching lines @@
   }
   RelocInfo rinfo(isolate(), pc_, rmode, data, NULL);
   reloc_info_writer.Write(&rinfo);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32