cc1_main: Do not print statistics in -disable_free mode.

[MatzeB]

Summary

llvm statistics are currently printed when the destructor of a
"static ManagedStatic<StatisticInfo> StatInfo" in llvm runs.
This destructor currently runs in each case as part of llvm_shutdown()
which is run even in disable_free mode as part of main(). I assume that
this hasn't always been the case.

Removing the special code here avoids the statistics getting printed
twice.

[bruno]

Assuming that it's guaranteed that the other path would always print out the statistics, LGTM

cfe/trunk/tools/driver/cc1_main.cpp

#endif
 
   // Our error handler depends on the Diagnostics object, which we're
   // potentially about to delete. Uninstall the handler now so that any
   // later errors use the default handling behavior instead.
   llvm::remove_fatal_error_handler();
 
   // When running with -disable-free, don't do any destruction or shutdown.
   if (Clang->getFrontendOpts().DisableFree) {
-    if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
-      llvm::PrintStatistics();
     BuryPointer(std::move(Clang));
     return !Success;
   }
 
   return !Success;
 }