cranelift/gcc: add const {Meta,}Sized to minicore

As before, but adding constness.

Author: davidtwco

compiler/rustc_codegen_cranelift/example/mini_core.rs

@@ -9,7 +9,8 @@
     transparent_unions,
     auto_traits,
     freeze_impls,
-    thread_local
+    thread_local,
+    const_trait_impl
 )]
 #![no_core]
 #![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
@@ -18,9 +19,11 @@
 pub trait PointeeSized {}
 
 #[lang = "meta_sized"]
+#[const_trait]
 pub trait MetaSized: PointeeSized {}
 
 #[lang = "sized"]
+#[const_trait]
 pub trait Sized: MetaSized {}
 
 #[lang = "destruct"]

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -1,7 +1,7 @@
 #![feature(
     no_core, lang_items, intrinsics, unboxed_closures, extern_types,
     decl_macro, rustc_attrs, transparent_unions, auto_traits, freeze_impls,
-    thread_local
+    thread_local, const_trait_impl
 )]
 #![no_core]
 #![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
@@ -15,9 +15,11 @@ unsafe extern "C" fn _Unwind_Resume() {
 pub trait PointeeSized {}
 
 #[lang = "meta_sized"]
+#[const_trait]
 pub trait MetaSized: PointeeSized {}
 
 #[lang = "sized"]
+#[const_trait]
 pub trait Sized: MetaSized {}
 
 #[lang = "destruct"]