Reland "[snapshot] Ship lazy TFJ builtins"

This is a reland of 56da97bb
Original change's description:
> [snapshot] Ship lazy TFJ builtins
> 
> Design doc: goo.gl/dxkYDZ
> 
> Bug: v8:6624
> Change-Id: I8813f79e415843ffe8d33a605a2662dbfc0c9764
> Reviewed-on: https://chromium-review.googlesource.com/674883
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Michael Hablich <hablich@chromium.org>
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48590}

TBR=yangguo@chromium.org,hablich@chromium.org

Bug: v8:6624, v8:6942
Change-Id: I1af6b0982f7e129127f2714c27a74b7e39207065
Reviewed-on: https://chromium-review.googlesource.com/721179
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48605}

src/flag-definitions.h

@@ -281,7 +281,6 @@ DEFINE_BOOL(future, FUTURE_BOOL,
             "not-too-far future")
 
 DEFINE_IMPLICATION(future, preparser_scope_analysis)
-DEFINE_IMPLICATION(future, lazy_deserialization)
 
 // Flags for experimental implementation features.
 DEFINE_BOOL(allocation_site_pretenuring, true,
@@ -938,7 +937,7 @@ DEFINE_INT(runtime_stats, 0,
 DEFINE_VALUE_IMPLICATION(runtime_call_stats, runtime_stats, 1)
 
 // snapshot-common.cc
-DEFINE_BOOL(lazy_deserialization, false,
+DEFINE_BOOL(lazy_deserialization, true,
             "Deserialize code lazily from the snapshot.")
 DEFINE_BOOL(trace_lazy_deserialization, false, "Trace lazy deserialization.")
 DEFINE_BOOL(profile_deserialization, false,