Index: lib/Target/AArch64/AArch64DeadRegisterDefinitionsPass.cpp
===================================================================
--- lib/Target/AArch64/AArch64DeadRegisterDefinitionsPass.cpp
+++ lib/Target/AArch64/AArch64DeadRegisterDefinitionsPass.cpp
@@ -123,6 +123,8 @@
         MO.setReg(NewReg);
         DEBUG(MI.print(dbgs()));
         ++NumDeadDefsReplaced;
+        // Only replace one dead register
+        break;
       }
     }
   }