Make Box::new use owned_box_new lang item

Author: est31

compiler/rustc_hir/src/lang_items.rs

@@ -276,6 +276,7 @@ language_item_table! {
     EhCatchTypeinfo,         sym::eh_catch_typeinfo,   eh_catch_typeinfo,          Target::Static,         GenericRequirement::None;
 
     OwnedBox,                sym::owned_box,           owned_box,                  Target::Struct,         GenericRequirement::Minimum(1);
+    OwnedBoxNew,             sym::owned_box_new,       owned_box_new,              Target::Method(MethodKind::Inherent), GenericRequirement::None;
 
     PhantomData,             sym::phantom_data,        phantom_data,               Target::Struct,         GenericRequirement::Exact(1);
 

compiler/rustc_span/src/symbol.rs

@@ -1037,6 +1037,7 @@ symbols! {
         out,
         overlapping_marker_traits,
         owned_box,
+        owned_box_new,
         packed,
         panic,
         panic_2015,

library/alloc/src/boxed.rs

@@ -207,6 +207,7 @@ impl<T> Box<T> {
     /// let five = Box::new(5);
     /// ```
     #[cfg(all(not(no_global_oom_handling)))]
+    #[lang = "owned_box_new"]
     #[inline(always)]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]