Revert "Revert "[parser] FLAG_aggressive_lazy_functions = true for a test run.""

This reverts commit aee29a9f.

Reason for revert: Bot is alive again, doing this test run now.

Original change's description:
> Revert "[parser] FLAG_aggressive_lazy_functions = true for a test run."
> 
> This reverts commit 0d51a259.
> 
> Reason for revert: Bot is broken; makes no sense to run the experiment now.
> 
> Original change's description:
> > [parser] FLAG_aggressive_lazy_functions = true for a test run.
> > 
> > Just to get the RuntimeCallstats data. To be reverted soon.
> > 
> > BUG=v8:5516
> > NOTREECHECKS=true
> > 
> > Change-Id: I4bb436900a79bb383bf8132002a129b601efdfe3
> > Reviewed-on: https://chromium-review.googlesource.com/618987
> > Reviewed-by: Adam Klein <adamk@chromium.org>
> > Commit-Queue: Marja Hölttä <marja@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#47416}
> 
> TBR=adamk@chromium.org,machenbach@chromium.org,marja@chromium.org
> 
> Change-Id: I8506ae7e1e16a4d0b320a486f743c01f7f82e0f2
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: v8:5516
> Reviewed-on: https://chromium-review.googlesource.com/620749
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#47425}

TBR=adamk@chromium.org,machenbach@chromium.org,marja@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:5516
Change-Id: I09d8da398da33076db1656f3241e3de8e05757b7
Reviewed-on: https://chromium-review.googlesource.com/623047Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47460}

src/flag-definitions.h

@@ -887,7 +887,7 @@ DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax")
 DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing")
 DEFINE_BOOL(trace_preparse, false, "trace preparsing decisions")
 DEFINE_BOOL(lazy_inner_functions, true, "enable lazy parsing inner functions")
-DEFINE_BOOL(aggressive_lazy_inner_functions, false,
+DEFINE_BOOL(aggressive_lazy_inner_functions, true,
             "even lazier inner function parsing")
 DEFINE_IMPLICATION(aggressive_lazy_inner_functions, lazy_inner_functions)
 DEFINE_BOOL(preparser_scope_analysis, false,