Preparsing inner functions: Tentatively turn on FLAG_lazy_inner_functions.

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2567953003
Cr-Commit-Position: refs/heads/master@{#41673}

src/flag-definitions.h

@@ -849,7 +849,7 @@ DEFINE_BOOL(trace_maps, false, "trace map creation")
 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, false, "enable lazy parsing inner functions")
+DEFINE_BOOL(lazy_inner_functions, true, "enable lazy parsing inner functions")
 
 // simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc
 DEFINE_BOOL(trace_sim, false, "Trace simulator execution")