forgot header guard😅

Author: paperchalice

llvm/include/llvm/CodeGen/GCEmptyBasicBlocks.h

@@ -6,6 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifndef LLVM_CODEGEN_GCEMPTYBASICBLOCKS_H
+#define LLVM_CODEGEN_GCEMPTYBASICBLOCKS_H
+
 #include "llvm/CodeGen/MachinePassManager.h"
 
 namespace llvm {
@@ -17,3 +20,5 @@ class GCEmptyBasicBlocksPass : public PassInfoMixin<GCEmptyBasicBlocksPass> {
 };
 
 } // namespace llvm
+
+#endif // LLVM_CODEGEN_GCEMPTYBASICBLOCKS_H