merge with stable

Added signature for changeset 8a7bd2dccd44

Added tag 2.5.4 for changeset 8a7bd2dccd44

applyupdates: assign variable before we try to use it (issue3855) The variable 'fd' was getting used with a value left over from a prior iteration, causing a KeyError: '.hgsubstate'.

merge with mpm

perf: add a command to test addremove performance Upcoming patches will improve addremove performance. This command will be used to demonstrate that improvement.

merge with crew

dirstate: only call lstat once per flags invocation This makes a big difference to performance in some cases. hg --time locate 'set:symlink()' mozilla-central (70,000 files): before: 2.92 sec after: 2.47 another repo (170,000 files): before: 7.87 sec after: 6.86

util: add functions to check symlink/exec bits These are not yet used.

Merge with stable.