Sort all of Clang's files under 'lib', and fix up the broken headers
uncovered.

This required manually correcting all of the incorrect main-module
headers I could find, and running the new llvm/utils/sort_includes.py
script over the files.

I also manually added quite a few missing headers that were uncovered by
shuffling the order or moving headers up to be main-module-headers.

llvm-svn: 169237
diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index 24ec6bb..a064541 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -11,14 +11,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Support/ErrorHandling.h"
 #include "clang/AST/Expr.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
-#include "clang/AST/ASTContext.h"
-#include "clang/AST/DeclObjC.h"
-#include "clang/AST/DeclCXX.h"
-#include "clang/AST/DeclTemplate.h"
+#include "llvm/Support/ErrorHandling.h"
 using namespace clang;
 
 typedef Expr::Classification Cl;