[BUG?] git stash push fails on removed file pathspec

[Alexandr Miloslavskiy <alexandr.miloslavskiy@xxxxxxxxxxx>]

Hi all,

Steps:

$git init TestRepo && cd TestRepo
$echo 1 >1.txt
$git add . && git commit -m 1
$git rm 1.txt
$git stash push -- 1.txt
  error: pathspec ':(,prefix:0)1.txt' did not match any file(s) known 
to git
  Did you forget to 'git add'?

At the same time, `git stash push` and `git commit -m 1 -- 1.txt` work 
as expected, stashing/committing removed file.

I tested in these versions and it happens in both:
* 2.36.0.rc0.9.g07330a41d6 (current master)
* 2.35.0