[BOLT][DWARF] Remove option to write to DWP (#100771)

Remove the --write-dwp option as well as related code and tests.

Author: sayhaan

bolt/include/bolt/Rewrite/DWARFRewriter.h

@@ -15,7 +15,6 @@
 #include "bolt/Core/GDBIndex.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/DIE.h"
-#include "llvm/DWP/DWP.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/Support/ToolOutputFile.h"
 #include <cstdint>
@@ -41,13 +40,6 @@ class DWARFRewriter {
     uint64_t TypeHash;
     uint64_t TypeDIERelativeOffset;
   };
-  /// Contains information for CU or TU so we can output correct {cu, tu}-index.
-  struct UnitMeta {
-    uint64_t Offset;
-    uint64_t Length;
-    uint64_t TUHash;
-  };
-  using UnitMetaVectorType = std::vector<UnitMeta>;
 
 private:
   BinaryContext &BC;
@@ -194,35 +186,6 @@ class DWARFRewriter {
                      const std::string &, DebugLocWriter &,
                      DebugStrOffsetsWriter &, DebugStrWriter &);
   using KnownSectionsEntry = std::pair<MCSection *, DWARFSectionKind>;
-  struct DWPState {
-    std::unique_ptr<ToolOutputFile> Out;
-    std::unique_ptr<BinaryContext> TmpBC;
-    std::unique_ptr<MCStreamer> Streamer;
-    std::unique_ptr<DWPStringPool> Strings;
-    /// Used to store String sections for .dwo files if they are being modified.
-    std::vector<std::unique_ptr<DebugBufferVector>> StrSections;
-    const MCObjectFileInfo *MCOFI = nullptr;
-    const DWARFUnitIndex *CUIndex = nullptr;
-    std::deque<SmallString<32>> UncompressedSections;
-    MapVector<uint64_t, UnitIndexEntry> IndexEntries;
-    MapVector<uint64_t, UnitIndexEntry> TypeIndexEntries;
-    StringMap<KnownSectionsEntry> KnownSections;
-    uint32_t ContributionOffsets[8] = {};
-    uint32_t IndexVersion = 2;
-    uint64_t DebugInfoSize = 0;
-    uint16_t Version = 0;
-    bool IsDWP = false;
-  };
-  /// Init .dwp file
-  void initDWPState(DWPState &);
-
-  /// Write out .dwp File
-  void finalizeDWP(DWPState &);
-
-  /// add content of dwo to .dwp file.
-  void updateDWP(DWARFUnit &, const OverriddenSectionsMap &, const UnitMeta &,
-                 UnitMetaVectorType &, DWPState &, DebugLocWriter &,
-                 DebugStrOffsetsWriter &, DebugStrWriter &);
 };
 
 } // namespace bolt

bolt/lib/Rewrite/CMakeLists.txt

@@ -1,7 +1,6 @@
 set(LLVM_LINK_COMPONENTS
   Core
   DebugInfoDWARF
-  DWP
   JITLink
   MC
   Object