Rollup merge of #118147 - Nilstrieb:no-redundant-casts, r=WaffleLapkin

Fix some unnecessary casts

`x clippy compiler -Aclippy::all -Wclippy::unnecessary_cast --fix` with some manual review to ensure every fix is correct.

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -2268,11 +2268,7 @@ fn encode_metadata_impl(tcx: TyCtxt<'_>, path: &Path) {
     file.seek(std::io::SeekFrom::Start(pos_before_seek)).unwrap();
 
     // Record metadata size for self-profiling
-    tcx.prof.artifact_size(
-        "crate_metadata",
-        "crate_metadata",
-        file.metadata().unwrap().len() as u64,
-    );
+    tcx.prof.artifact_size("crate_metadata", "crate_metadata", file.metadata().unwrap().len());
 }
 
 pub fn provide(providers: &mut Providers) {

compiler/rustc_metadata/src/rmeta/table.rs

@@ -497,7 +497,7 @@ impl<I: Idx, const N: usize, T: FixedSizeEncoding<ByteArray = [u8; N]>> TableBui
         }
 
         LazyTable::from_position_and_encoded_size(
-            NonZeroUsize::new(pos as usize).unwrap(),
+            NonZeroUsize::new(pos).unwrap(),
             width,
             self.blocks.len(),
         )