If git merge --no-commit is used to merge a commit adding a 
file with an unusual mode -- specifically a symlink which has "mode" 120000,
it fails to stage the right mode into the index.

This only happens when core.symlinks=false. I noticed it on FAT, but
have managed to reproduce it on ext4.

Here's an example of the bug:

joey@darkstar:~>git clone r1 r2
Cloning into 'r2'...
joey@darkstar:~>cd r1
joey@darkstar:~/r1>ls -l
total 0
lrwxrwxrwx 1 joey joey 11 Jun 12 21:23 foo -> /etc/passwd
joey@darkstar:~/r1>git mv foo bar
joey@darkstar:~/r1>git commit -m moved
[master 516a53c] moved
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename foo => bar (100%)
joey@darkstar:~/r1>cd ..
joey@darkstar:~>cd r2
joey@darkstar:~/r2>git config core.symlinks false
joey@darkstar:~/r2>git fetch origin
remote: Counting objects: 2, done.
remote: Total 2 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (2/2), done.
From /home/joey/r1
   7ab8102..516a53c  master     -> origin/master
joey@darkstar:~/r2>git merge origin/master --no-commit --no-ff
Automatic merge went well; stopped before committing as requested
joey@darkstar:~/r2>git diff --cached
diff --git a/bar b/bar
new file mode 100644
index 0000000..3594e94
--- /dev/null
+++ b/bar
@@ -0,0 +1 @@
\ No newline at end of file
diff --git a/foo b/foo
deleted file mode 120000
index 3594e94..0000000
--- a/foo
+++ /dev/null
@@ -1 +0,0 @@
\ No newline at end of file
joey@darkstar:~/r2>git commit -m oops
[master 63bd960] oops
joey@darkstar:~/r2>git show
commit 63bd9608c96a91582b27c5853ff58053bab6c71c
Merge: 7ab8102 516a53c
Author: Joey Hess <j...@kitenet.net>
Date:   Thu Jun 12 21:37:35 2014 -0400


diff --cc bar
index 0000000,3594e94..3594e94
mode 000000,120000..100644
--- a/bar
+++ b/bar

joey@darkstar:~/r2>git version
git version 2.0.0

see shy jo

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