Remove warning about very large JS functions. (#20812)

Users have little they can do if they see this warning, and we were showing it
even if the user built in the modes that the message suggest they use. in
addition, this warning is likely not important these days given the huge
improvements in JS VMs over the years.

Fixes #20811

tools/js_optimizer.py

@@ -329,11 +329,6 @@ def write_chunk(chunk, i):
       if not os.environ.get('EMCC_NO_OPT_SORT'):
         funcs.sort(key=lambda x: (len(x[1]), x[0]), reverse=True)
 
-      if 'last' in passes and len(funcs):
-        count = funcs[0][1].count('\n')
-        if count > 3000:
-          print('warning: Output contains some very large functions (%s lines in %s), consider building source files with -Os or -Oz)' % (count, funcs[0][0]), file=sys.stderr)
-
       for func in funcs:
         f.write(func[1])
       funcs = None