Importing rustc-1.66.0

Test: ./build.py --lto=thin
Bug: 263153841
Change-Id: I36050e4015d71a3dab9097947b43644e09c4c648
diff --git a/microdroid_manager/src/swap.rs b/microdroid_manager/src/swap.rs
index d7916db..2f4d176 100644
--- a/microdroid_manager/src/swap.rs
+++ b/microdroid_manager/src/swap.rs
@@ -66,7 +66,7 @@
     f.write_all(Uuid::new_v4().as_bytes())?;
 
     // Write the magic signature string.
-    f.seek(SeekFrom::Start((pagesize - 10) as u64))?;
+    f.seek(SeekFrom::Start(pagesize - 10))?;
     f.write_all("SWAPSPACE2".as_bytes())?;
 
     Ok(())