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

[Alexander Yermolovich via llvm-commits]

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@@ -1697,22 +1693,41 @@ void BinaryContext::preprocessDebugInfo() {
 
     auto It = llvm::partition_point(
         AllRanges, [=](CURange R) { return R.HighPC <= FunctionAddress; });
-    if (It != AllRanges.end() && It->LowPC <= FunctionAddress)
-      Function.setDWARFUnit(It->Unit);
+    if (It == AllRanges.end() || It->LowPC > FunctionAddress) {
+      continue;
+    }
+    Function.addDWARFUnit(It->Unit);
+
+    // Go forward and add all units from ranges that cover the function
+    while (++It != AllRanges.end()) {
+      if (It->LowPC <= FunctionAddress && FunctionAddress < It->HighPC) {
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ayermolo wrote:

simplify logic

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