add naive_layout_of query

Author: moulins

tests/fail/layout_cycle.rs

@@ -1,5 +1,5 @@
 //@error-in-other-file: a cycle occurred during layout computation
-//~^ ERROR: cycle detected when computing layout of
+//~^ ERROR: cycle detected when computing layout (naive) of
 
 use std::mem;
 

tests/fail/layout_cycle.stderr

@@ -1,7 +1,8 @@
-error[E0391]: cycle detected when computing layout of `S<S<()>>`
+error[E0391]: cycle detected when computing layout (naive) of `S<S<()>>`
    |
-   = note: ...which requires computing layout of `<S<()> as Tr>::I`...
-   = note: ...which again requires computing layout of `S<S<()>>`, completing the cycle
+   = note: ...which requires computing layout (naive) of `<S<()> as Tr>::I`...
+   = note: ...which again requires computing layout (naive) of `S<S<()>>`, completing the cycle
+   = note: cycle used when computing layout of `S<S<()>>`
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: post-monomorphization error: a cycle occurred during layout computation