[Rust] Have LowLevelILBlock derive Clone rather than manually implementing it

This is possible now that FunctionMutability and FunctionForm require
Copy, and fixes an existing clippy warning about the non-canonical
implementation of `clone` on a `Copy` type.

Author: bdash

rust/src/low_level_il/block.rs

@@ -19,7 +19,7 @@ use crate::basic_block::{BasicBlock, BlockContext};
 
 use super::*;
 
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub struct LowLevelILBlock<'func, M, F>
 where
     M: FunctionMutability,
@@ -63,18 +63,6 @@ where
     }
 }
 
-impl<M, F> Clone for LowLevelILBlock<'_, M, F>
-where
-    M: FunctionMutability,
-    F: FunctionForm,
-{
-    fn clone(&self) -> Self {
-        LowLevelILBlock {
-            function: self.function,
-        }
-    }
-}
-
 pub struct LowLevelILBlockIter<'func, M, F>
 where
     M: FunctionMutability,