adding is_freeze to TyLayoutMethods

Author: saleemjaffer

src/librustc/ty/layout.rs

@@ -1961,6 +1961,14 @@ impl<'a, 'tcx, C> TyLayoutMethods<'tcx, C> for Ty<'tcx>
         }
     }
 
+    fn is_freeze(
+        this: TyLayout<'tcx>,
+        cx: &C,
+        param_env: Self::ParamEnv,
+    )-> bool {
+        this.ty.is_freeze(cx.tcx(), param_env, DUMMY_SP)
+    }
+
 }
 
 struct Niche {

src/librustc_target/abi/mod.rs

@@ -947,6 +947,11 @@ pub trait TyLayoutMethods<'a, C: LayoutOf<Ty = Self>>: Sized {
         offset: Size,
         param_env: Self::ParamEnv,
     ) -> Option<PointeeInfo>;
+    fn is_freeze(
+        this: TyLayout<'a, Self>,
+        cx: &C,
+        param_env: Self::ParamEnv,
+    )-> bool;
 }
 
 impl<'a, Ty> TyLayout<'a, Ty> {
@@ -964,6 +969,10 @@ impl<'a, Ty> TyLayout<'a, Ty> {
     where Ty: TyLayoutMethods<'a, C>, C: LayoutOf<Ty = Ty> {
         Ty::pointee_info_at(self, cx, offset, param_env)
     }
+    pub fn is_freeze<C>(self, cx: &C, param_env: Ty::ParamEnv) -> bool
+    where Ty: TyLayoutMethods<'a, C>, C: LayoutOf<Ty = Ty> {
+        Ty::is_freeze(self, cx, param_env)
+    }
 }
 
 impl<'a, Ty> TyLayout<'a, Ty> {