OptimizationRemarkEmitter.h - reduce unnecessary Function.h include to forward declaration. NFC.

llvm/include/llvm/Analysis/OptimizationRemarkEmitter.h

@@ -17,11 +17,11 @@
 #include "llvm/ADT/Optional.h"
 #include "llvm/Analysis/BlockFrequencyInfo.h"
 #include "llvm/IR/DiagnosticInfo.h"
-#include "llvm/IR/Function.h"
 #include "llvm/IR/PassManager.h"
 #include "llvm/Pass.h"
 
 namespace llvm {
+class Function;
 class Value;
 
 /// The optimization diagnostic interface.