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

[Sayhaan Siddiqui 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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sayhaan wrote:

We would still need `appendToRangeBuffer()` since `RangesStream` is a protected member and we call `appendToRangeBuffer()`  outside of `DebugRangesSectionWriter`, correct? But since it's a single line now we can define it in `DebugData.h` instead of `DebugData.cpp`.

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