Turn off shared function info-based optimization.

In order to address a performance issue.

BUG=v8:5512, chromium:664937

Review-Url: https://codereview.chromium.org/2506003002
Cr-Commit-Position: refs/heads/master@{#41041}

src/flag-definitions.h

@@ -274,7 +274,7 @@ DEFINE_BOOL(track_field_types, true, "track field types")
 DEFINE_IMPLICATION(track_field_types, track_fields)
 DEFINE_IMPLICATION(track_field_types, track_heap_object_fields)
 DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations")
-DEFINE_BOOL(mark_shared_functions_for_tier_up, true,
+DEFINE_BOOL(mark_shared_functions_for_tier_up, false,
             "mark shared functions for tier up")
 
 // Flags for optimization types.