MCTargetOptionsCommandFlags.h - remove unnecessary includes. NFC.

Replace with MCTargetOptions forward declaration and move includes down to MCTargetOptionsCommandFlags.cpp

llvm/include/llvm/MC/MCTargetOptionsCommandFlags.h

@@ -15,11 +15,12 @@
 #define LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
 
 #include "llvm/ADT/Optional.h"
-#include "llvm/MC/MCTargetOptions.h"
-#include "llvm/Support/CommandLine.h"
+#include <string>
 
 namespace llvm {
 
+class MCTargetOptions;
+
 namespace mc {
 
 bool getRelaxAll();

llvm/lib/MC/MCTargetOptionsCommandFlags.cpp

@@ -13,6 +13,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
+#include "llvm/MC/MCTargetOptions.h"
+#include "llvm/Support/CommandLine.h"
 
 using namespace llvm;