adapt the default data-layout for aarch64 following llvm change

Author: krasimirgg

compiler/rustc_target/src/spec/targets/aarch64_unknown_linux_gnu.rs

@@ -10,7 +10,7 @@ pub fn target() -> Target {
             std: None,
         },
         pointer_width: 64,
-        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".into(),
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32".into(),
         arch: "aarch64".into(),
         options: TargetOptions {
             features: "+v8a,+outline-atomics".into(),