Remove useless method.

Author: cjgillot

compiler/rustc_middle/src/ich/hcx.rs

@@ -250,13 +250,6 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
         &CACHE
     }
 
-    fn byte_pos_to_line_and_col(
-        &mut self,
-        byte: BytePos,
-    ) -> Option<(Lrc<SourceFile>, usize, BytePos)> {
-        self.source_map().byte_pos_to_line_and_col(byte)
-    }
-
     fn span_data_to_lines_and_cols(
         &mut self,
         span: &SpanData,

compiler/rustc_span/src/hygiene.rs

@@ -1362,12 +1362,6 @@ fn update_disambiguator(expn_id: ExpnId) {
         fn hash_spans(&self) -> bool {
             true
         }
-        fn byte_pos_to_line_and_col(
-            &mut self,
-            byte: BytePos,
-        ) -> Option<(Lrc<SourceFile>, usize, BytePos)> {
-            self.caching_source_map.byte_pos_to_line_and_col(byte)
-        }
         fn span_data_to_lines_and_cols(
             &mut self,
             span: &crate::SpanData,

compiler/rustc_span/src/lib.rs

@@ -1874,10 +1874,6 @@ pub trait HashStableContext {
     fn expn_id_cache() -> &'static LocalKey<ExpnIdCache>;
     fn hash_crate_num(&mut self, _: CrateNum, hasher: &mut StableHasher);
     fn hash_spans(&self) -> bool;
-    fn byte_pos_to_line_and_col(
-        &mut self,
-        byte: BytePos,
-    ) -> Option<(Lrc<SourceFile>, usize, BytePos)>;
     fn span_data_to_lines_and_cols(
         &mut self,
         span: &SpanData,