Unify all validity check intrinsics

Also merges the inhabitedness check into the query to further unify the
code paths.

compiler/rustc_middle/src/query/mod.rs

@@ -2173,8 +2173,8 @@ rustc_queries! {
         separate_provide_extern
     }
 
-    query check_validity_of_init(key: (InitKind, ty::ParamEnvAnd<'tcx, Ty<'tcx>>)) -> Result<bool, ty::layout::LayoutError<'tcx>> {
-        desc { "checking to see if `{}` permits being left {}", key.1.value, key.0 }
+    query check_validity_requirement(key: (ValidityRequirement, ty::ParamEnvAnd<'tcx, Ty<'tcx>>)) -> Result<bool, ty::layout::LayoutError<'tcx>> {
+        desc { "checking validity requirement for `{}`: {}", key.1.value, key.0 }
     }
 
     query compare_impl_const(