Revert "ManagedStatic: remove many straightforward uses in llvm"

This reverts commit e6f1f06245.

Reverting due to a failure on the fuchsia-x86_64-linux buildbot.

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -69,6 +69,7 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
@@ -7445,9 +7446,10 @@ class BitcodeErrorCategoryType : public std::error_category {
 
 } // end anonymous namespace
 
+static ManagedStatic<BitcodeErrorCategoryType> ErrorCategory;
+
 const std::error_category &llvm::BitcodeErrorCategory() {
-  static BitcodeErrorCategoryType ErrorCategory;
-  return ErrorCategory;
+  return *ErrorCategory;
 }
 
 static Expected<StringRef> readBlobInRecord(BitstreamCursor &Stream,