[cpu-profiler] Turn on detailed line info for optimized code

Cautiously turn on this flag by default to check the impact on
performance bots. Could show minor regressions in old space and/or
code_and_metadata memory buckets.

Bug: v8:7983
Change-Id: Ic4369cdb0231f4f88eada699da948e8bb48a25fd
Reviewed-on: https://chromium-review.googlesource.com/1162234
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54908}

src/flag-definitions.h

@@ -1253,9 +1253,8 @@ DEFINE_BOOL(log_function_events, false,
 DEFINE_BOOL(prof, false,
             "Log statistical profiling information (implies --log-code).")
 
-DEFINE_BOOL(detailed_line_info, false,
+DEFINE_BOOL(detailed_line_info, true,
             "Always generate detailed line information for CPU profiling.")
-DEFINE_IMPLICATION(future, detailed_line_info)
 
 #if defined(ANDROID)
 // Phones and tablets have processors that are much slower than desktop