Add clang_tot config to 'CFI Linux ToT' bot.

Otherwise, GN does not get that it's a ToT build and the build dir
is not clobbered.

BUG=617771

Review-Url: https://codereview.chromium.org/2039103003
Cr-Commit-Position: refs/heads/master@{#398177}

tools/mb/mb_config.pyl

@@ -97,7 +97,7 @@
         '//build/args/bots/chromium.fyi/blimp_linux_dbg.gn',
       'Browser Side Navigation Linux': 'gn_release_bot',
       'CFI Linux CF': 'gn_cfi_diag_release_static',
-      'CFI Linux ToT': 'gn_cfi_release_static',
+      'CFI Linux ToT': 'gn_cfi_clang_tot_release_static',
       'CFI Linux': 'gn_cfi_release_static',
       'Chromium Linux Goma Canary': 'gn_release_bot',
       'Chromium Linux Goma Canary (clobber)': 'gn_release_bot',
@@ -1096,6 +1096,10 @@
       'gn', 'cfi', 'release', 'static',
     ],
 
+    'gn_cfi_clang_tot_release_static': [
+      'gn', 'cfi', 'clang_tot', 'release', 'static',
+    ],
+
     'gn_cfi_release_static_dcheck_always_on': [
       'gn', 'cfi', 'release', 'static', 'dcheck_always_on',
     ],