LLVMContextImpl.h - cleanup includes and forward declarations. NFC.
Reduce StringRef.h include to forward declaration.
Remove unnecessary ConstantFP/ConstantInt forward declarations as we have to include Constants.h
diff --git a/llvm/lib/IR/LLVMContextImpl.h b/llvm/lib/IR/LLVMContextImpl.h
index 26e08d2..52e9c06 100644
--- a/llvm/lib/IR/LLVMContextImpl.h
+++ b/llvm/lib/IR/LLVMContextImpl.h
@@ -29,7 +29,6 @@
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
@@ -53,8 +52,7 @@
namespace llvm {
-class ConstantFP;
-class ConstantInt;
+class StringRef;
class Type;
class Value;
class ValueHandleBase;