account for safe target features in fndef<->closure and fndef<->fndef coerce-lubs

Author: BoxyUwU

compiler/rustc_public/src/mir/body.rs

@@ -978,7 +978,7 @@ pub enum Safety {
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Serialize)]
 pub enum PointerCoercion {
     /// Go from a fn-item type to a fn-pointer type.
-    ReifyFnPointer,
+    ReifyFnPointer(Safety),
 
     /// Go from a safe fn pointer to an unsafe fn pointer.
     UnsafeFnPointer,

compiler/rustc_public/src/unstable/convert/stable/ty.rs

@@ -130,7 +130,9 @@ impl<'tcx> Stable<'tcx> for ty::adjustment::PointerCoercion {
     ) -> Self::T {
         use rustc_middle::ty::adjustment::PointerCoercion;
         match self {
-            PointerCoercion::ReifyFnPointer => crate::mir::PointerCoercion::ReifyFnPointer,
+            PointerCoercion::ReifyFnPointer(safety) => {
+                crate::mir::PointerCoercion::ReifyFnPointer(safety.stable(tables, cx))
+            }
             PointerCoercion::UnsafeFnPointer => crate::mir::PointerCoercion::UnsafeFnPointer,
             PointerCoercion::ClosureFnPointer(safety) => {
                 crate::mir::PointerCoercion::ClosureFnPointer(safety.stable(tables, cx))