local-clone: also copy tags related caches

This caches provide a large speedup for some repositories. Keeping it around is
valuable.

mercurial/hg.py

@@ -427,6 +427,9 b' def _cachetocopy(srcrepo):'
     cachefiles = ['branch2']
     cachefiles += ['branch2-%s' % f for f in repoview.filtertable]
     cachefiles += ['rbc-names-v1', 'rbc-revs-v1']
+    cachefiles += ['tags2']
+    cachefiles += ['tags2-%s' % f for f in repoview.filtertable]
+    cachefiles += ['hgtagsfnodes1']
     return cachefiles
 
 def clone(ui, peeropts, source, dest=None, pull=False, rev=None,

tests/test-tags.t

@@ -724,3 +724,11 b' Check that the bundle includes cache dat'
       f63cc8fe54e4d326f8d692805d70e092f851ddb1
       40f0358cb314c824a5929ee527308d90e023bc10
   hgtagsfnodes -- 'sortdict()'
+
+Check that local clone includes cache data
+
+  $ hg clone tagsclient tags-local-clone
+  updating to branch default
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ (cd tags-local-clone/.hg/cache/; ls -1 tag*)
+  tags2-visible