Use local and remapped paths where appropriate

Author: cbeuw

src/common.rs

@@ -334,7 +334,9 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
         let topmost = span.ctxt().outer_expn().expansion_cause().unwrap_or(span);
         let caller = self.tcx.sess.source_map().lookup_char_pos(topmost.lo());
         let const_loc = self.tcx.const_caller_location((
-            rustc_span::symbol::Symbol::intern(&caller.file.name.to_string()),
+            rustc_span::symbol::Symbol::intern(
+                &caller.file.name.prefer_remapped().to_string_lossy(),
+            ),
             caller.line as u32,
             caller.col_display as u32 + 1,
         ));

src/debuginfo/line_info.rs

@@ -87,7 +87,7 @@ fn line_program_add_file(
         filename => {
             let dir_id = line_program.default_directory();
             let dummy_file_name = LineString::new(
-                filename.to_string().into_bytes(),
+                filename.prefer_remapped().to_string().into_bytes(),
                 line_program.encoding(),
                 line_strings,
             );