make test-revert check executable bit.

tests/test-revert

@@ -54,4 +54,18 b' echo %% should silently add a'
 hg revert -r0 a
 hg st a
 
+hg update -C
+chmod +x c
+hg revert
+echo %% should print non-executable
+test -x c || echo non-executable
+
+chmod +x c
+hg commit -d '1000001 0' -m exe
+
+chmod -x c
+hg revert
+echo %% should print executable
+test -x c && echo executable
+
 true

tests/test-revert.out

@@ -45,3 +45,9 b' forgetting z'
 forgetting a
 %% should silently add a
 A a
+reverting c
+%% should print non-executable
+non-executable
+reverting c
+%% should print executable
+executable