RFR(XS): 7902486: jcheck still fails with mercurial 4.8+

[Mikael Vidstedt]

Please review this change which fixes a problem with jcheck and hg 4.8+:

http://cr.openjdk.java.net/~mikael/webrevs/jcheck/7902486/webrev.00/webrev/

Also inline here for your convenience:

diff -r 4ac08a4210ec jcheck.py
--- a/jcheck.py Wed May 29 10:25:28 2019 -0700
+++ b/jcheck.py Sat Jun 29 00:44:27 2019 -0700
@@ -801,7 +801,7 @@
         nop = lambda c, fns: None
         iter = cmdutil.walkchangerevs(repo, _matchall(repo), opts, nop)
         for ctx in iter:
-            ch.check(ctx, ctx.node())
+            ch.check(ctx.rev(), ctx.node())
     except (AttributeError, TypeError):
         # AttributeError:  matchall does not exist in hg < 1.1
         # TypeError:  walkchangerevs args differ in hg <= 1.3.1

Cheers,
Mikael