[gold/ThinLTO] Invoke llvm_shutdown when exiting after ThinLTO indexing

Summary:
Instead of manually invoking PrintStatistics, simply invoke
llvm_shutdown which will take care of destroying managed statics, and as
a side effect will destroy the StatisticInfo ManagedStatic, invoking
PrintStatistics when needed.

Reviewers: fhahn

Subscribers: inglorion, llvm-commits

Differential Revision: https://reviews.llvm.org/D45820

llvm-svn: 330341

tools/gold/gold-plugin.cpp

@@ -1061,8 +1061,7 @@ static ld_plugin_status allSymbolsReadHook() {
     return LDPS_OK;
 
   if (options::thinlto_index_only) {
-    if (llvm::AreStatisticsEnabled())
-      llvm::PrintStatistics();
+    llvm_shutdown();
     cleanup_hook();
     exit(0);
   }