Add pad_to_align to syscall payload value (#1175)

From Layout::extend documentation:

In order to match C representation layout repr(C), you should call
pad_to_align after extending the layout with all fields. (There is no
way to match the default Rust representation layout repr(Rust), as it is
unspecified.)

Author: JulianGCalderon

src/libfuncs/starknet.rs

@@ -1574,7 +1574,7 @@ pub fn build_deploy<'ctx, 'this>(
                 )?;
 
                 let payload_ty = llvm::r#type::r#struct(context, &[p0_ty, p1_ty], false);
-                let payload_layout = p0_layout.extend(p1_layout)?.0;
+                let payload_layout = p0_layout.extend(p1_layout)?.0.pad_to_align();
 
                 let full_layout = tag_layout.extend(payload_layout)?.0;
                 layout = Layout::from_size_align(