[libFuzzer] Use long long to ensure 64 bits.

[mpividori]

Summary

We need to always use unsigned long long to ensure 64 bits. On Windows, unsigned long is 4 bytes.
This was the reason why value-profile-cmp4.test was failing on Windows.

[mpividori]

@kcc do you agree with these changes?

[kcc]

LGTM

lib/Fuzzer/FuzzerTracePC.cpp

void TracePC::AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2,
   TORCW.Insert(Idx ^ Hash, Word(B1, Len), Word(B2, Len));
 }
 
 template <class T>
 ATTRIBUTE_TARGET_POPCNT ALWAYS_INLINE
 ATTRIBUTE_NO_SANITIZE_ALL
 void TracePC::HandleCmp(uintptr_t PC, T Arg1, T Arg2) {
   uint64_t ArgXor = Arg1 ^ Arg2;
-  uint64_t ArgDistance = __builtin_popcountl(ArgXor) + 1; // [1,65]
+  uint64_t ArgDistance = __builtin_popcountll(ArgXor) + 1; // [1,65]
   uintptr_t Idx = ((PC & 4095) + 1) * ArgDistance;
   if (sizeof(T) == 4)
       TORC4.Insert(ArgXor, Arg1, Arg2);
   else if (sizeof(T) == 8)
       TORC8.Insert(ArgXor, Arg1, Arg2);
   ValueProfileMap.AddValue(Idx);
 }
 

lib/Fuzzer/FuzzerValueBitMap.h

bool MergeFrom(ValueBitMap &Other) {
     for (size_t i = 0; i < kMapSizeInWords; i++) {
       auto O = Other.Map[i];
       auto M = Map[i];
       if (O) {
         Map[i] = (M |= O);
         Other.Map[i] = 0;
       }
       if (M)
-        Res += __builtin_popcountl(M);
+        Res += __builtin_popcountll(M);
     }
     NumBits = Res;
     return OldNumBits < NumBits;
   }
 
   template <class Callback>
   ATTRIBUTE_NO_SANITIZE_ALL
   void ForEach(Callback CB) {