Index: lib/CodeGen/AsmPrinter/DwarfDebug.cpp
===================================================================
--- lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1752,7 +1752,7 @@
     }
 
     // Sort the symbols by offset within the section.
-    std::sort(
+    std::stable_sort(
         List.begin(), List.end(), [&](const SymbolCU &A, const SymbolCU &B) {
           unsigned IA = A.Sym ? Asm->OutStreamer->GetSymbolOrder(A.Sym) : 0;
           unsigned IB = B.Sym ? Asm->OutStreamer->GetSymbolOrder(B.Sym) : 0;