llvm: Tolerate dead_on_return attribute changes

The attribute now has a size parameter and sorts differently:
* Explicitly omit size parameter during construction on 23+
* Tolerate alternate sorting in tests

https://github.com/llvm/llvm-project/pull/171712

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -527,6 +527,12 @@ LLVMRustCreateAttrNoValue(LLVMContextRef C, LLVMRustAttributeKind RustAttr) {
         *unwrap(C), CaptureInfo(CaptureComponents::Address |
                                 CaptureComponents::ReadProvenance)));
   }
+#endif
+#if LLVM_VERSION_GE(23, 0)
+  if (RustAttr == LLVMRustAttributeKind::DeadOnReturn) {
+    return wrap(Attribute::getWithDeadOnReturnInfo(*unwrap(C),
+                                                   llvm::DeadOnReturnInfo()));
+  }
 #endif
   return wrap(Attribute::get(*unwrap(C), fromRust(RustAttr)));
 }