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/functional/ex_cmds/excmd_spec.lua

@@ -29,13 +29,13 @@ describe('Ex cmds', function()
       ':tabnext 9999999999999999999999999999999999999999',
       'Vim(tabnext):E475: Invalid argument: 9999999999999999999999999999999999999999'
     )
-    check_excmd_err(
-      ':N 9999999999999999999999999999999999999999',
-      'Vim(Next):E939: Positive count required'
+    eq(
+      'Vim(Next):E163: There is only one file to edit',
+      pcall_err(command, ':N 9999999999999999999999999999999999999999')
     )
     check_excmd_err(
       ':bdelete 9999999999999999999999999999999999999999',
-      'Vim(bdelete):E939: Positive count required'
+      'Vim(bdelete):E516: No buffers were deleted'
     )
     eq(
       'Vim(menu):E329: No menu "9999999999999999999999999999999999999999"',

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