[DWARFLinker][DWARFLinkerParallel][NFC] Refactor DWARFLinker&DWARFLinkerParallel to have a common library. Part 1. (#75925)

This patch creates DWARFLinkerBase library, places DWARFLinker code into
DWARFLinker\Classic, places DWARFLinkerParallel into DWARFLinker\Parallel.
updates BOLT to use new library. This patch is NFC.

Author: avl-llvm

bolt/lib/Rewrite/CMakeLists.txt

@@ -5,6 +5,7 @@ set(LLVM_LINK_COMPONENTS
   MC
   Object
   Support
+  DWARFLinkerBase
   DWARFLinker
   AsmPrinter
   TargetParser

bolt/lib/Rewrite/DWARFRewriter.cpp

@@ -21,7 +21,7 @@
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/DIE.h"
-#include "llvm/DWARFLinker/DWARFStreamer.h"
+#include "llvm/DWARFLinker/Classic/DWARFStreamer.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
@@ -178,6 +178,9 @@ translateInputToOutputLocationList(const BinaryFunction &BF,
   return MergedLL;
 }
 
+using namespace dwarf_linker;
+using namespace dwarf_linker::classic;
+
 namespace llvm {
 namespace bolt {
 /// Emits debug information into .debug_info or .debug_types section.
@@ -278,10 +281,10 @@ class DIEStreamer : public DwarfStreamer {
 
 public:
   DIEStreamer(DIEBuilder *DIEBldr, DWARFRewriter &Rewriter,
-              DWARFLinker::OutputFileType OutFileType,
+              DWARFLinkerBase::OutputFileType OutFileType,
               raw_pwrite_stream &OutFile,
               std::function<StringRef(StringRef Input)> Translator,
-              DWARFLinker::messageHandler Warning)
+              DWARFLinkerBase::MessageHandlerTy Warning)
       : DwarfStreamer(OutFileType, OutFile, Translator, Warning),
         DIEBldr(DIEBldr), Rewriter(Rewriter){};
 
@@ -457,7 +460,7 @@ createDIEStreamer(const Triple &TheTriple, raw_pwrite_stream &OutFile,
                   DWARFRewriter &Rewriter) {
 
   std::unique_ptr<DIEStreamer> Streamer = std::make_unique<DIEStreamer>(
-      &DIEBldr, Rewriter, llvm::DWARFLinker::OutputFileType::Object, OutFile,
+      &DIEBldr, Rewriter, DWARFLinkerBase::OutputFileType::Object, OutFile,
       [](StringRef Input) -> StringRef { return Input; },
       [&](const Twine &Warning, StringRef Context, const DWARFDie *) {});
   Error Err = Streamer->init(TheTriple, Swift5ReflectionSegmentName);

llvm/include/llvm/DWARFLinkerParallel/AddressesMap.h renamed to llvm/include/llvm/DWARFLinker/AddressesMap.h

@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DWARFLINKERPARALLEL_ADDRESSESMAP_H
-#define LLVM_DWARFLINKERPARALLEL_ADDRESSESMAP_H
+#ifndef LLVM_DWARFLINKER_ADDRESSESMAP_H
+#define LLVM_DWARFLINKER_ADDRESSESMAP_H
 
 #include "llvm/ADT/AddressRanges.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
@@ -17,7 +17,7 @@
 #include <cstdint>
 
 namespace llvm {
-namespace dwarflinker_parallel {
+namespace dwarf_linker {
 
 /// Mapped value in the address map is the offset to apply to the
 /// linked address.
@@ -186,7 +186,7 @@ class AddressesMap {
   }
 };
 
-} // end of namespace dwarflinker_parallel
+} // namespace dwarf_linker
 } // end namespace llvm
 
-#endif // LLVM_DWARFLINKERPARALLEL_ADDRESSESMAP_H
+#endif // LLVM_DWARFLINKER_ADDRESSESMAP_H