Auto merge of rust-lang#115287 - saethlin:more-specialer, r=cjgillot

Add a specialization for encoding byte arrays in rmeta

This specialization already exists for FileEncoder, but since EncodeContext is implemented by forwarding down to FileEncoder, using EncodeContext used to bypass the specialization.

Author: bors

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -347,6 +347,13 @@ impl<'a, 'tcx> Encodable<EncodeContext<'a, 'tcx>> for Symbol {
     }
 }
 
+impl<'a, 'tcx> Encodable<EncodeContext<'a, 'tcx>> for [u8] {
+    fn encode(&self, e: &mut EncodeContext<'a, 'tcx>) {
+        Encoder::emit_usize(e, self.len());
+        e.emit_raw_bytes(self);
+    }
+}
+
 impl<'a, 'tcx> TyEncoder for EncodeContext<'a, 'tcx> {
     const CLEAR_CROSS_CRATE: bool = true;