Common/BitSet: Amend byte size retrieval

This needs to divide by 8 to get a proper byte size for all type sizes.
The only usage of this is currently a uint64_t, so it worked by
coincidence, since sizeof(uint64_t) == 8.

FEXCore/Source/Interface/IR/Passes/IRValidation.cpp

@@ -46,7 +46,7 @@ void IRValidation::Run(IREmitter* IREmit) {
   OffsetToBlockMap.clear();
   EntryBlock = nullptr;
 
-  uint32_t Count = CurrentIR.GetSSACount();
+  const auto Count = CurrentIR.GetSSACount();
   if (Count > MaxNodes) {
     NodeIsLive.Realloc(Count);
   }