chore: revert "chore: temporarily remove test broken by leanprover#4746"

This reverts commit 7aec6c9.

tests/lean/ctor_layout.lean

@@ -0,0 +1,18 @@
+import Lean.Compiler.IR
+
+open Lean
+open Lean.IR
+
+unsafe def main : IO Unit :=
+withImportModules #[{module := `Lean.Compiler.IR.Basic}] {} 0 fun env => do
+   let ctorLayout ← IO.ofExcept $ getCtorLayout env `Lean.IR.Expr.reuse;
+   ctorLayout.fieldInfo.forM $ fun finfo => IO.println (format finfo);
+   IO.println "---";
+   let ctorLayout ← IO.ofExcept $ getCtorLayout env `Lean.EnvironmentHeader.mk;
+   ctorLayout.fieldInfo.forM $ fun finfo => IO.println (format finfo);
+   IO.println "---";
+   let ctorLayout ← IO.ofExcept $ getCtorLayout env `Subtype.mk;
+   ctorLayout.fieldInfo.forM $ fun finfo => IO.println (format finfo);
+   pure ()
+
+#eval main

tests/lean/ctor_layout.lean.expected.out

@@ -0,0 +1,15 @@
+obj@0
+obj@1
+scalar#1@0:u8
+obj@2
+---
+scalar#4@0:u32
+scalar#1@4:u8
+obj@0
+obj@1
+obj@2
+obj@3
+obj@4
+---
+obj@0
+◾