rhg: Use binary search in manifest lookup ? instead of linear scan, when looking for a single entry based on its path. Manifest entries are sorted by path, but are variable-size so we can?t use the standard library?s `[T]::binary_search`. We can still jump to a byte index and then look around for entry boundaries. Differential Revision: https://phab.mercurial-scm.org/D11932

--- a/rust/rhg/src/commands/status.rs	Fri Dec 17 11:46:30 2021 +0100
+++ b/rust/rhg/src/commands/status.rs	Thu Dec 16 17:34:51 2021 +0100
@@ -473,7 +473,7 @@
     };
 
     let entry = manifest
-        .find_file(hg_path)?
+        .find_by_path(hg_path)?
         .expect("ambgious file not in p1");
     if entry.flags != fs_flags {
         return Ok(true);