Propagate a Failure from GenerateDictionaryNegativeLookup instead of causing GC.

src/x64/code-stubs-x64.h

 // Copyright 2011 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 422 matching lines @@
   enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP };
 
   StringDictionaryLookupStub(Register dictionary,
                              Register result,
                              Register index,
                              LookupMode mode)
       : dictionary_(dictionary), result_(result), index_(index), mode_(mode) { }
 
   void Generate(MacroAssembler* masm);
 
-  static void GenerateNegativeLookup(MacroAssembler* masm,
-                                     Label* miss,
-                                     Label* done,
-                                     Register properties,
-                                     String* name,
-                                     Register r0);
+  MUST_USE_RESULT static MaybeObject* GenerateNegativeLookup(
+      MacroAssembler* masm,
+      Label* miss,
+      Label* done,
+      Register properties,
+      String* name,
+      Register r0);
 
   static void GeneratePositiveLookup(MacroAssembler* masm,
                                      Label* miss,
                                      Label* done,
                                      Register elements,
                                      Register name,
                                      Register r0,
                                      Register r1);
 
  private:
@@ skipping 32 matching lines @@
   Register dictionary_;
   Register result_;
   Register index_;
   LookupMode mode_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODE_STUBS_X64_H_