Mention that the file size limit is only for text files

Author: tyilo

compiler/rustc_span/src/source_map.rs

@@ -116,7 +116,7 @@ impl FileLoader for RealFileLoader {
 
     fn read_file(&self, path: &Path) -> io::Result<String> {
         if path.metadata().is_ok_and(|metadata| metadata.len() > u32::MAX.into()) {
-            return Err(io::Error::other("rustc does not support files larger than 4 GiB"));
+            return Err(io::Error::other("rustc does not support text files larger than 4 GiB"));
         }
         fs::read_to_string(path)
     }
@@ -300,7 +300,7 @@ impl SourceMap {
     /// unmodified.
     pub fn new_source_file(&self, filename: FileName, src: String) -> Lrc<SourceFile> {
         self.try_new_source_file(filename, src).unwrap_or_else(|OffsetOverflowError| {
-            eprintln!("fatal error: rustc does not support files larger than 4 GiB");
+            eprintln!("fatal error: rustc does not support text files larger than 4 GiB");
             crate::fatal_error::FatalError.raise()
         })
     }