DbgEntityHistoryCalculator.h - reduce DebugInfoMetadata.h include to forward declarations. NFC.

llvm/include/llvm/CodeGen/DbgEntityHistoryCalculator.h

@@ -12,12 +12,13 @@
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/IR/DebugInfoMetadata.h"
 #include <utility>
 
 namespace llvm {
 
 class DILocalVariable;
+class DILocation;
+class DINode;
 class MachineFunction;
 class MachineInstr;
 class TargetRegisterInfo;