[llvm] [BOLT][DWARF] Refactor legacy ranges writers (PR #96006)

[Maksim Panchenko via llvm-commits]

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@@ -211,6 +211,12 @@ class DebugRangesSectionWriter {
     return Writer->getKind() == RangesWriterKind::DebugRangesWriter;
   }
 
+  void appendToRangeBuffer(const DebugBufferVector &CUBuffer);
+
+  void setDie(std::optional<DIE *> Die) { this->Die = Die; }
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maksfb wrote:

There's no need to pass `DIE *` as `std::optional<>`.

https://github.com/llvm/llvm-project/pull/96006