[llvm] [BOLT][DWARF] Refactor address ranges processing (PR #71225)

[Alexander Yermolovich via llvm-commits]

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@@ -4251,92 +4251,88 @@ uint64_t BinaryFunction::translateInputToOutputAddress(uint64_t Address) const {
                   BB->getOutputAddressRange().second);
 }
 
-DebugAddressRangesVector BinaryFunction::translateInputToOutputRanges(
-    const DWARFAddressRangesVector &InputRanges) const {
-  DebugAddressRangesVector OutputRanges;
+DebugAddressRangesVector
+BinaryFunction::translateInputToOutputRange(DebugAddressRange InRange) const {
+  DebugAddressRangesVector OutRanges;
 
+  // The function was removed from the output. Return an empty range.
   if (isFolded())
-    return OutputRanges;
+    return OutRanges;
 
-  // If the function hasn't changed return the same ranges.
+  // If the function hasn't changed return the same range.
   if (!isEmitted()) {
-    OutputRanges.resize(InputRanges.size());
-    llvm::transform(InputRanges, OutputRanges.begin(),
-                    [](const DWARFAddressRange &Range) {
-                      return DebugAddressRange(Range.LowPC, Range.HighPC);
-                    });
-    return OutputRanges;
+    OutRanges.emplace_back(InRange);
+    return OutRanges;
+  }
+
+  if (!containsAddress(InRange.LowPC))
+    return OutRanges;
+
+  // Special case of an empty range [X, X). Some tools expect X to be updated.
+  if (InRange.LowPC == InRange.HighPC) {
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ayermolo wrote:

what happens here when lowPC is tombstoned to 0?

https://github.com/llvm/llvm-project/pull/71225