[ORC] Preserve order of constructors with same priority

Constructors with the same priority should keep their relative order
that was specified. This is important for clang-repl with many const
variables after commit 05137ecfca ("[clang-repl] Emit const variables
only once").

---

Fixes #15511

interpreter/llvm-project/llvm-project.tag

@@ -1 +1 @@
-ROOT-llvm16-20240604-01
+ROOT-llvm16-20240614-01

interpreter/llvm-project/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp

@@ -590,7 +590,7 @@ GlobalCtorDtorScraper::operator()(ThreadSafeModule TSM,
 
       for (auto E : COrDtors)
         InitsOrDeInits.push_back(std::make_pair(E.Func, E.Priority));
-      llvm::sort(InitsOrDeInits, llvm::less_second());
+      llvm::stable_sort(InitsOrDeInits, llvm::less_second());
 
       auto *InitOrDeInitFuncEntryBlock =
           BasicBlock::Create(Ctx, "entry", InitOrDeInitFunc);