Control whether to renumber the working set when rebuilding it

cli/src/invocation/cmd/gc.rs

@@ -4,7 +4,7 @@ use termcolor::WriteColor;
 
 pub(crate) fn execute<W: WriteColor>(w: &mut W, replica: &mut Replica) -> Fallible<()> {
     log::debug!("rebuilding working set");
-    replica.rebuild_working_set()?;
+    replica.rebuild_working_set(true)?;
     writeln!(w, "garbage collected.")?;
     Ok(())
 }