Fix invalid debug code assertion on x64.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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 4256 matching lines @@
   Isolate* isolate = masm->isolate();
 
   // Load rcx with the allocation site.  We stick an undefined dummy value here
   // and replace it with the real allocation site later when we instantiate this
   // stub in BinaryOpICWithAllocationSiteStub::GetCodeCopyFromTemplate().
   __ Move(rcx, handle(isolate->heap()->undefined_value()));
 
   // Make sure that we actually patched the allocation site.
   if (FLAG_debug_code) {
     __ testb(rcx, Immediate(kSmiTagMask));
-    __ Assert(zero, kExpectedAllocationSite);
+    __ Assert(not_equal, kExpectedAllocationSite);
     __ Cmp(FieldOperand(rcx, HeapObject::kMapOffset),
            isolate->factory()->allocation_site_map());
     __ Assert(equal, kExpectedAllocationSite);
   }
 
   // Tail call into the stub that handles binary operations with allocation
   // sites.
   BinaryOpWithAllocationSiteStub stub(state_);
   __ TailCallStub(&stub);
 }
@@ skipping 1245 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64