clang: include ManagedStatic.h for llvm_shutdown

[nhaehnle]

Summary

The code relied on ManagedStatic.h being included indirectly. This is
about to change as uses of ManagedStatic are removed throughout the
codebase.

[efriedma]

LGTM

clang/unittests/Interpreter/InterpreterTest.cpp

 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclGroup.h"
 #include "clang/AST/Mangle.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/Sema.h"
 
+#include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/TargetSelect.h"
 
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 using namespace clang;
 
 namespace {

clang/utils/TableGen/TableGen.cpp

 //===- TableGen.cpp - Top-Level TableGen implementation for Clang ---------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains the main function for Clang's TableGen.
 //
 //===----------------------------------------------------------------------===//
 
 #include "TableGenBackends.h" // Declares all backends.
 #include "ASTTableGen.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Main.h"
 #include "llvm/TableGen/Record.h"
 
 using namespace llvm;
 using namespace clang;