[Flags] Enable bytecode flushing.

BUG=v8:8395

Change-Id: Ie900be7d146d3a7ded13565b94b192807bc7eb28
Reviewed-on: https://chromium-review.googlesource.com/c/1417930
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59106}

src/flag-definitions.h

@@ -295,7 +295,6 @@ DEFINE_BOOL(future, FUTURE_BOOL,
             "not-too-far future")
 
 DEFINE_IMPLICATION(future, write_protect_code_memory)
-DEFINE_IMPLICATION(future, flush_bytecode)
 
 // Flags for experimental implementation features.
 DEFINE_BOOL(allocation_site_pretenuring, true,
@@ -774,7 +773,7 @@ DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
 DEFINE_BOOL(never_compact, false,
             "Never perform compaction on full GC - testing only")
 DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
-DEFINE_BOOL(flush_bytecode, V8_LITE_BOOL,
+DEFINE_BOOL(flush_bytecode, true,
             "flush of bytecode when it has not been executed recently")
 DEFINE_BOOL(stress_flush_bytecode, false, "stress bytecode flushing")
 DEFINE_IMPLICATION(stress_flush_bytecode, flush_bytecode)