Add missing test file.

Author: brammool

src/testdir/test_tagjump.vim

@@ -0,0 +1,9 @@
+" Tests for tagjump (tags and special searches)
+
+" SEGV occurs in older versions.  (At least 7.4.1748 or older)
+func Test_ptag_with_notagstack()
+  set notagstack
+  call assert_fails('ptag does_not_exist_tag_name', 'E426')
+  set tagstack&vim
+endfunc
+" vim: sw=2 et