Index: llvm/include/llvm/IR/DebugInfoMetadata.h
===================================================================
--- llvm/include/llvm/IR/DebugInfoMetadata.h
+++ llvm/include/llvm/IR/DebugInfoMetadata.h
@@ -1643,8 +1643,8 @@
   /// written explicitly by the user (e.g. cleanup stuff in C++ put on a closing
   /// bracket). It's useful for code coverage to not show a counter on "empty"
   /// lines.
-  bool isImplicitCode() const { return ImplicitCode; }
-  void setImplicitCode(bool ImplicitCode) { this->ImplicitCode = ImplicitCode; }
+  bool isImplicitCode() const { return SubclassData1; }
+  void setImplicitCode(bool ImplicitCode) { SubclassData1 = ImplicitCode; }
 
   DIFile *getFile() const { return getScope()->getFile(); }
   StringRef getFilename() const { return getScope()->getFilename(); }
Index: llvm/include/llvm/IR/Metadata.h
===================================================================
--- llvm/include/llvm/IR/Metadata.h
+++ llvm/include/llvm/IR/Metadata.h
@@ -67,10 +67,8 @@
 
   /// Storage flag for non-uniqued, otherwise unowned, metadata.
   unsigned char Storage : 7;
-  // TODO: expose remaining bits to subclasses.
-
-  unsigned char ImplicitCode : 1;
 
+  unsigned char SubclassData1 : 1;
   unsigned short SubclassData16 = 0;
   unsigned SubclassData32 = 0;
 
@@ -82,7 +80,7 @@
 
 protected:
   Metadata(unsigned ID, StorageType Storage)
-      : SubclassID(ID), Storage(Storage), ImplicitCode(false) {
+      : SubclassID(ID), Storage(Storage), SubclassData1(false) {
     static_assert(sizeof(*this) == 8, "Metadata fields poorly packed");
   }