vim-patch:8.2.3573: cannot decide whether to skip test that fails with 64 bit

Problem:    Cannot decide whether to skip test that fails with 64 bit ints.
            (closes vim/vim#9072)
Solution:   Add v:sizeofint, v:sizeoflong and v:sizeofpointer.  Improve the
            check for multiply overflow.
69b3072d98

Omit v:sizeof{int,long,pointer} as they're only really used for tests.

runtime/doc/vim_diff.txt

@@ -494,6 +494,9 @@ Eval:
   *js_encode()*
   *js_decode()*
   *v:none* (used by Vim to represent JavaScript "undefined"); use |v:null| instead.
+  *v:sizeofint*
+  *v:sizeoflong*
+  *v:sizeofpointer*
 
 Events:
   *SigUSR1* Use |Signal| to detect `SIGUSR1` signal instead.

src/nvim/ops.c

@@ -3434,7 +3434,8 @@ void do_put(int regname, yankreg_T *reg, int dir, long count, int flags)
         const long multlen = count * yanklen;
 
         totlen = (size_t)(int)multlen;
-        if (totlen != (size_t)multlen) {
+        if (totlen != (size_t)multlen || (long)totlen / count != yanklen
+            || (long)totlen / yanklen != count) {
           emsg(_(e_resulting_text_too_long));
           break;
         } else if (totlen > 0) {

src/nvim/testdir/test_put.vim

@@ -139,13 +139,6 @@ func Test_p_with_count_leaves_mark_at_end()
 endfunc
 
 func Test_very_large_count()
-  " FIXME: should actually check if sizeof(int) == sizeof(long)
-  CheckNotMSWindows
-
-  if v:numbersize != 64
-    throw 'Skipped: only works with 64 bit numbers'
-  endif
-
   new
   let @" = 'x'
   call assert_fails('norm 44444444444444p', 'E1240:')