[AST] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC).

llvm-svn: 319487
diff --git a/clang/lib/AST/ExprObjC.cpp b/clang/lib/AST/ExprObjC.cpp
index 31c1b3f..e1a23f5 100644
--- a/clang/lib/AST/ExprObjC.cpp
+++ b/clang/lib/AST/ExprObjC.cpp
@@ -1,4 +1,4 @@
-//===--- ExprObjC.cpp - (ObjC) Expression AST Node Implementation ---------===//
+//===- ExprObjC.cpp - (ObjC) Expression AST Node Implementation -----------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -12,8 +12,15 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/AST/ExprObjC.h"
-
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/SelectorLocationsKind.h"
+#include "clang/AST/Type.h"
+#include "clang/AST/TypeLoc.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
 
 using namespace clang;
 
@@ -45,7 +52,6 @@
 
 ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(const ASTContext &C,
                                                 unsigned NumElements) {
-
   void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(NumElements));
   return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements);
 }