Add AssertSmi() in x64 MacroAssembler::SmiTest().

src/x64/macro-assembler-x64.cc

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1140 matching lines @@
   sar(dst, Immediate(kSmiShift));
 }
 
 
 void MacroAssembler::SmiToInteger64(Register dst, const Operand& src) {
   movsxlq(dst, Operand(src, kSmiShift / kBitsPerByte));
 }
 
 
 void MacroAssembler::SmiTest(Register src) {
+  AssertSmi(src);
   testq(src, src);
 }
 
 
 void MacroAssembler::SmiCompare(Register smi1, Register smi2) {
   AssertSmi(smi1);
   AssertSmi(smi2);
   cmpq(smi1, smi2);
 }
 
@@ skipping 3519 matching lines @@
   j(greater, &no_memento_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationMemento::kSize),
               Heap::kAllocationMementoMapRootIndex);
   bind(&no_memento_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64