Fix builds where LLVM_ENABLE_STATS is disabled

Missed Stats->EnableStats rename in rG3fb832fe8bdc317687d5a4d2ca20f5f73b089341

llvm/lib/Support/Statistic.cpp

@@ -242,7 +242,7 @@ void llvm::PrintStatistics() {
   // Check if the -stats option is set instead of checking
   // !Stats.Stats.empty().  In release builds, Statistics operators
   // do nothing, so stats are never Registered.
-  if (Stats) {
+  if (EnableStats) {
     // Get the stream to write to.
     std::unique_ptr<raw_ostream> OutStream = CreateInfoOutputFile();
     (*OutStream) << "Statistics are disabled.  "