Reverse the loop order

src/coreclr/jit/optimizer.cpp

@@ -6301,11 +6301,20 @@ void Compiler::optHoistLoopNest(unsigned lnum, LoopHoistContext* hoistCtxt)
 
         BitVecTraits m_visitedTraits(fgBBNumMax * 2, this);
         BitVec       m_visited(BitVecOps::MakeEmpty(&m_visitedTraits));
-        hoistCtxt->PushVnSetForSiblingLoop(this);
 
+        // Since loops in optLoopTable are arranged in reverse execution order, arrange
+        // them back in execution order before processing.
+        ArrayStack<unsigned> childLoops(getAllocatorLoopHoist());
         for (unsigned child = optLoopTable[lnum].lpChild; child != BasicBlock::NOT_IN_LOOP;
              child          = optLoopTable[child].lpSibling)
         {
+            childLoops.Push(child);
+        }
+
+        hoistCtxt->PushVnSetForSiblingLoop(this);
+        while (!childLoops.Empty())
+        {
+            unsigned child = childLoops.Pop();
             optHoistLoopNest(child, hoistCtxt);
             VNSet* hoistedInCurLoop = hoistCtxt->ExtractHoistedInCurLoop();