[llvm] [BOLT] Fix debug line emission for functions in multiple compilation units (PR #151230)

[Alexander Yermolovich via llvm-commits]

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@@ -423,8 +423,8 @@ class BinaryFunction {
   /// Original LSDA type encoding
   unsigned LSDATypeEncoding{dwarf::DW_EH_PE_omit};
 
-  /// Containing compilation unit for the function.
-  DWARFUnit *DwarfUnit{nullptr};
+  /// All compilation units this function belongs to.
+  SmallVector<DWARFUnit *, 1> DwarfUnitVec;
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ayermolo wrote:

DenseSet, if they don't need to be ordered?

https://github.com/llvm/llvm-project/pull/151230