perf: unbust perfbdiff --alldata

This broke in f84fc6a92817 due to a refactored manifest API.

The fix is a bit hacky - perfbdiff doesn't yet support tree manifests
for example. But it gets the job done.

A test has been added for --alldata so this doesn't happen again.

contrib/perf.py

@@ -781,9 +781,9 b' def perfbdiff(ui, repo, file_, rev=None,'
         if opts['alldata']:
             # Load revisions associated with changeset.
             ctx = repo[rev]
-            mtext = repo.manifest.revision(ctx.manifestnode())
+            mtext = repo.manifestlog._revlog.revision(ctx.manifestnode())
             for pctx in ctx.parents():
-                pman = repo.manifest.revision(pctx.manifestnode())
+                pman = repo.manifestlog._revlog.revision(pctx.manifestnode())
                 textpairs.append((pman, mtext))
 
             # Load filelog revisions by iterating manifest delta.

tests/test-contrib-perf.t

@@ -114,6 +114,7 b' perfstatus'
   $ hg perfancestorset 2
   $ hg perfannotate a
   $ hg perfbdiff -c 1
+  $ hg perfbdiff --alldata 1
   $ hg perfbranchmap
   $ hg perfcca
   $ hg perfchangegroupchangelog