Turn on Ignition + TurboFan.

 _____            _ _   _
|_   _|          (_) | (_)
  | |  __ _ _ __  _| |_ _  ___  _ __
  | | / _` | '_ \| | __| |/ _ \| '_ \
 _| || (_| | | | | | |_| | (_) | | | |
 \___/\__, |_| |_|_|\__|_|\___/|_| |_|
       __/ |
      |___/

                    _
                  _| |_
                 |_   _|
                   |_|

 _____          _          ______
|_   _|        | |         |  ___|
  | |_   _ _ __| |__   ___ | |_ __ _ _ __
  | | | | | '__| '_ \ / _ \|  _/ _` | '_ \
  | | |_| | |  | |_) | (_) | || (_| | | | |
  \_/\__,_|_|  |_.__/ \___/\_| \__,_|_| |_|

BUG=v8:5267, v8:4280, chromium:692409
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2736723006
Cr-Commit-Position: refs/heads/master@{#43663}

src/flag-definitions.h

@@ -449,8 +449,7 @@ DEFINE_BOOL(omit_map_checks_for_leaf_maps, true,
 // Allow to disable turbofan with a build flag after it's turned on by default.
 #define TURBO_BOOL false
 #else
-// TODO(mvstanton): Turn on turbofan here.
-#define TURBO_BOOL false
+#define TURBO_BOOL true
 #endif
 DEFINE_BOOL(turbo, TURBO_BOOL, "enable TurboFan compiler")
 DEFINE_BOOL(turbo_sp_frame_access, false,