patch 8.2.1900: Vim9: command modifiers do not work

Problem:    Vim9: command modifiers do not work.
Solution:   Make most command modifiers work.
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index eadac27..3747ad5 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -1627,15 +1627,15 @@
   var res = execute('disass s:SilentMessage')
   assert_match('<SNR>\d*_SilentMessage\_s*' ..
         'silent echomsg "text"\_s*' ..
-        '\d SILENT\_s*' ..
+        '\d CMDMOD silent\_s*' ..
         '\d PUSHS "text"\_s*' ..
         '\d ECHOMSG 1\_s*' ..
-        '\d UNSILENT\_s*' ..
+        '\d CMDMOD_REV\_s*' ..
         'silent! echoerr "error"\_s*' ..
-        '\d SILENT!\_s*' ..
+        '\d CMDMOD silent!\_s*' ..
         '\d PUSHS "error"\_s*' ..
         '\d ECHOERR 1\_s*' ..
-        '\d UNSILENT!\_s*' ..
+        '\d CMDMOD_REV\_s*' ..
         '\d PUSHNR 0\_s*' ..
         '\d RETURN',
         res)