Revert "[DebugInfo][RemoveDIs] Add prototype storage classes for "new" debug-info"

And some intervening fixups. There are two remaining problems:
 * A memory leak via https://lab.llvm.org/buildbot/#/builders/236/builds/7120/steps/10/logs/stdio
 * A performance slowdown with -g where I'm not completely sure what the cause it

These might be fairly straightforwards to fix, but it's the end of the day
hear, so I figure I'll clear the buildbots til tomorrow.

This reverts commit 7d77bbe.
This reverts commit 9026f35.
This reverts commit d97b2b3.

Author: jmorse

llvm/include/llvm/IR/BasicBlock.h

@@ -19,7 +19,6 @@
 #include "llvm/ADT/ilist_node.h"
 #include "llvm/ADT/iterator.h"
 #include "llvm/ADT/iterator_range.h"
-#include "llvm/IR/DebugProgramInstruction.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/SymbolTableListTraits.h"
 #include "llvm/IR/Value.h"
@@ -57,9 +56,6 @@ class BasicBlock final : public Value, // Basic blocks are data objects also
                          public ilist_node_with_parent<BasicBlock, Function> {
 public:
   using InstListType = SymbolTableList<Instruction, ilist_iterator_bits<true>>;
-  /// Flag recording whether or not this block stores debug-info in the form
-  /// of intrinsic instructions (false) or non-instruction records (true).
-  bool IsNewDbgInfoFormat;
 
 private:
   friend class BlockAddress;
@@ -68,55 +64,6 @@ class BasicBlock final : public Value, // Basic blocks are data objects also
   InstListType InstList;
   Function *Parent;
 
-public:
-  /// Attach a DPMarker to the given instruction. Enables the storage of any
-  /// debug-info at this position in the program.
-  DPMarker *createMarker(Instruction *I);
-  DPMarker *createMarker(InstListType::iterator It);
-
-  /// Convert variable location debugging information stored in dbg.value
-  /// intrinsics into DPMarker / DPValue records. Deletes all dbg.values in
-  /// the process and sets IsNewDbgInfoFormat = true. Only takes effect if
-  /// the UseNewDbgInfoFormat LLVM command line option is given.
-  void convertToNewDbgValues();
-
-  /// Convert variable location debugging information stored in DPMarkers and
-  /// DPValues into the dbg.value intrinsic representation. Sets
-  /// IsNewDbgInfoFormat = false.
-  void convertFromNewDbgValues();
-
-  /// Ensure the block is in "old" dbg.value format (\p NewFlag == false) or
-  /// in the new format (\p NewFlag == true), converting to the desired format
-  /// if necessary.
-  void setIsNewDbgInfoFormat(bool NewFlag);
-
-  /// Validate any DPMarkers / DPValues attached to instructions in this block,
-  /// and block-level stored data too (TrailingDPValues).
-  /// \p Assert Should this method fire an assertion if a problem is found?
-  /// \p Msg Should this method print a message to errs() if a problem is found?
-  /// \p OS Output stream to write errors to.
-  /// \returns True if a problem is found.
-  bool validateDbgValues(bool Assert = true, bool Msg = false,
-                         raw_ostream *OS = nullptr);
-
-  /// Record that the collection of DPValues in \p M "trails" after the last
-  /// instruction of this block. These are equivalent to dbg.value intrinsics
-  /// that exist at the end of a basic block with no terminator (a transient
-  /// state that occurs regularly).
-  void setTrailingDPValues(DPMarker *M);
-
-  /// Fetch the collection of DPValues that "trail" after the last instruction
-  /// of this block, see \ref setTrailingDPValues. If there are none, returns
-  /// nullptr.
-  DPMarker *getTrailingDPValues();
-
-  /// Delete any trailing DPValues at the end of this block, see
-  /// \ref setTrailingDPValues.
-  void deleteTrailingDPValues();
-
-  void dumpDbgValues() const;
-
-private:
   void setParent(Function *parent);
 
   /// Constructor.

llvm/include/llvm/IR/DebugInfoMetadata.h

@@ -3765,10 +3765,6 @@ class DIArgList : public MDNode {
   iterator args_begin() { return Args.begin(); }
   iterator args_end() { return Args.end(); }
 
-  ReplaceableMetadataImpl *getReplaceableUses() {
-    return Context.getReplaceableUses();
-  }
-
   static bool classof(const Metadata *MD) {
     return MD->getMetadataID() == DIArgListKind;
   }