[Courgette] Using LabelManager to reduce Courgette-apply peak RAM by 25%.

courgette/disassembler_win32_x64.h

Index: courgette/disassembler_win32_x64.h
diff --git a/courgette/disassembler_win32_x64.h b/courgette/disassembler_win32_x64.h
index 60a2259fc03992ba319da1a24bfee8d4e8621d90..49ca45207b79c319a4feed918faa9ab46e8a1b49 100644
--- a/courgette/disassembler_win32_x64.h
+++ b/courgette/disassembler_win32_x64.h
@@ -54,6 +54,11 @@ class DisassemblerWin32X64 : public Disassembler {
   static std::string SectionName(const Section* section);
 
  protected:
+  // Disassembler interfaces.
+  RvaVisitor* CreateAbs32TargetRvaVisitor() override;
+  RvaVisitor* CreateRel32TargetRvaVisitor() override;
+  void RemoveUnusedRel32Locations(AssemblyProgram* program) override;
+
   CheckBool ParseFile(AssemblyProgram* target) WARN_UNUSED_RESULT;
   bool ParseAbs32Relocs();
   void ParseRel32RelocsFromSections();