Fix unsized field order

Author: nvzqz

compiler/rustc_codegen_cranelift/example/mini_core_hello_world.rs

@@ -56,8 +56,8 @@ struct NoisyDrop {
 }
 
 struct NoisyDropUnsized {
-    text: str,
     inner: NoisyDropInner,
+    text: str,
 }
 
 struct NoisyDropInner;

compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs

@@ -48,8 +48,8 @@ struct NoisyDrop {
 }
 
 struct NoisyDropUnsized {
-    text: str,
     inner: NoisyDropInner,
+    text: str,
 }
 
 struct NoisyDropInner;