tests/test-1102

dirstate.walk: eliminate src from yield

- restructure 'step two' to stat unseen files
- remove extra stat logic in status
- remove redundant src

#!/bin/sh

rm -rf a
hg init a
cd a
echo a > a
hg ci -Am0
hg tag t1 # 1
hg tag --remove t1 # 2

hg co 1
hg tag -r0 t1
hg tags