Implement Copy for i128 and u128 in minicore

Attempting to use these types currently causes an `error performing
operation: fully_perform`.

Author: tgross35

tests/auxiliary/minicore.rs

@@ -40,8 +40,11 @@ impl<T: ?Sized> LegacyReceiver for &mut T {}
 pub trait Copy: Sized {}
 
 impl_marker_trait!(
-    Copy => [ bool, char, isize, usize, i8, i16, i32, i64, u8, u16, u32, u64, f32, f64 ]
+    Copy => [
+        bool, char, isize, usize, i8, i16, i32, i64, i128, u8, u16, u32, u64, u128, f32, f64
+    ]
 );
+
 impl<'a, T: ?Sized> Copy for &'a T {}
 impl<T: ?Sized> Copy for *const T {}
 impl<T: ?Sized> Copy for *mut T {}