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

[Maksim Panchenko via llvm-commits]

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@@ -177,6 +177,12 @@ uint64_t DebugRangesSectionWriter::getSectionOffset() {
   return SectionOffset;
 }
 
+void DebugRangesSectionWriter::appendToRangeBuffer(
+    const DebugBufferVector &CUBuffer) {
+  *RangesStream << CUBuffer;
+  SectionOffset = RangesBuffer->size();
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maksfb wrote:

Are there cases where `SectionOffset` is out of sync with `RangesBuffer->size()`?

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