[fuzzer] Remove unused variable

[yln]

Summary

TempAutoDictionary is never used. Maybe a leftover of a previous
experiment?

[morehouse]

LGTM

compiler-rt/lib/fuzzer/FuzzerMutate.h

DictionaryEntry MakeDictionaryEntryFromCMP(const void *Arg1, const void *Arg2,
                                              size_t ArgSize,
                                              const uint8_t *Data, size_t Size);
 
   Random &Rand;
   const FuzzingOptions Options;
 
   // Dictionary provided by the user via -dict=DICT_FILE.
   Dictionary ManualDictionary;
-  // Temporary dictionary modified by the fuzzer itself,
-  // recreated periodically.
-  Dictionary TempAutoDictionary;
   // Persistent dictionary modified by the fuzzer, consists of
   // entries that led to successful discoveries in the past mutations.
   Dictionary PersistentAutoDictionary;
 
   Vector<DictionaryEntry *> CurrentDictionaryEntrySequence;
 
   static const size_t kCmpDictionaryEntriesDequeSize = 16;
   DictionaryEntry CmpDictionaryEntriesDeque[kCmpDictionaryEntriesDequeSize];