CFG.h - reduce includes to forward declarations. NFC.

Remove unnecessary includes from CFG.cpp.

Fix implicit include dependency in X86WinEHState.cpp.

llvm/include/llvm/Analysis/CFG.h

@@ -14,8 +14,8 @@
 #ifndef LLVM_ANALYSIS_CFG_H
 #define LLVM_ANALYSIS_CFG_H
 
-#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CFG.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include <utility>
 
 namespace llvm {
 
@@ -24,6 +24,7 @@ class DominatorTree;
 class Function;
 class Instruction;
 class LoopInfo;
+template <typename T> class SmallVectorImpl;
 
 /// Analyze the specified function to find all of the loop backedges in the
 /// function and return them.  This is a relatively cheap (compared to

llvm/lib/Analysis/CFG.cpp

@@ -12,8 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Analysis/CFG.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallSet.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/IR/Dominators.h"
 

llvm/lib/Target/X86/X86WinEHState.cpp

@@ -19,6 +19,7 @@
 #include "llvm/Analysis/EHPersonalities.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/WinEHFuncInfo.h"
+#include "llvm/IR/CFG.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instructions.h"