[foozzie] Stop using asm validator until results are more stable

The results are too noisy ATM. This switches off validate-asm for
default comparisons. We can add back dedicated jobs later that switch
it on.

BUG=chromium:663714
NOTRY=true
TBR=bradnelson@chromium.org,titzer@chromium.org

Review-Url: https://codereview.chromium.org/2640743004
Cr-Commit-Position: refs/heads/master@{#42467}

tools/foozzie/v8_foozzie.py

@@ -27,7 +27,7 @@ CONFIGS = dict(
   noturbo_opt=['--always-opt', '--turbo-filter=~', '--noturbo-asm'],
   ignition=['--ignition', '--turbo-filter=~', '--hydrogen-filter=~',
             '--novalidate-asm'],
-  ignition_staging=['--ignition-staging'],
+  ignition_staging=['--ignition-staging', '--novalidate-asm'],
   ignition_turbo=['--ignition-staging', '--turbo', '--novalidate-asm'],
   ignition_turbo_opt=['--ignition-staging', '--turbo', '--always-opt',
                       '--novalidate-asm'],