vim-patch:8.2.4065: computation overflow with large cound for :yank

Problem:    Computation overflow with large cound for :yank.
Solution:   Avoid an overflow.

3cf21b3051

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_excmd.vim

@@ -722,9 +722,14 @@ func Test_address_line_overflow()
     throw 'Skipped: only works with 64 bit long ints'
   endif
   new
-  call setline(1, 'text')
+  call setline(1, range(100))
   call assert_fails('|.44444444444444444444444', 'E1247:')
   call assert_fails('|.9223372036854775806', 'E1247:')
+
+  $
+  yank 77777777777777777777
+  call assert_equal("99\n", @")
+
   bwipe!
 endfunc