[CodeGen] Remove unused forward declarations Instruction and Type

The last uses were removed by:

  commit 79b3f0823e562fc652c3272b2ccfb99174445fa6
  Author: Tim Northover <tnorthover@apple.com>
  Date:   Tue Feb 7 11:28:00 2023 +0000

diff --git a/llvm/include/llvm/CodeGen/StackProtector.h b/llvm/include/llvm/CodeGen/StackProtector.h
index b52a937..70a3abf 100644 (file)
--- a/llvm/include/llvm/CodeGen/StackProtector.h
+++ b/llvm/include/llvm/CodeGen/StackProtector.h
@@ -27,11 +27,9 @@ namespace llvm {
 
 class BasicBlock;
 class Function;
-class Instruction;
 class Module;
 class TargetLoweringBase;
 class TargetMachine;
-class Type;
 
 class StackProtector : public FunctionPass {
 private: