Fix iOS sim bot to for the new Chromium roll

Bug: b/199044368, chromium:1249456
Change-Id: I0d91abca55618d87dc8366315182729e2a2b1016
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/231954
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Andrey Logvin <landrey@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#34992}

tools_webrtc/mb/mb_config.pyl

@@ -400,6 +400,7 @@
     ],
     'ios_debug_bot_x64': [
       'ios', 'debug_bot', 'x64', 'ios_use_goma_rbe', 'xctest',
+      'ios_old_os_support',
     ],
 
     # More configs
@@ -499,6 +500,11 @@
       'gn_args': 'target_os="ios"',
     },
 
+    # TODO(crbug.com/1249456): Remove use_lld=false
+    'ios_old_os_support' :{
+      'gn_args': 'use_lld=false',
+    },
+
     'no_goma': {
       'gn_args': 'use_goma=false',
     },