[compiler] Enable feedback collection in generic lowering

Turbofan now has support for generating generic code in two variants,
with and without feedback collection. Currently, feedback is collected
only for some load and store operators (historical reasons).

This CL enables feedback collection for (almost) all operators by
default. The exception in the default TF configuration are call and
construct variants (see also https://crrev.com/c/2276042). In NCI mode,
all operators collect feedback.

Regression have looked acceptable in our benchmarks so far. This is an
experiment to see impact on real world. If successful, the
non-collecting variants can be removed.

Bug: v8:8888
Change-Id: I0dddc7113ce94071552d5c4d992471db5ac5f989
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2239571
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68710}

src/flags/flag-definitions.h

@@ -684,7 +684,7 @@ DEFINE_BOOL(turbo_nci_as_highest_tier, false,
             "purposes.")
 DEFINE_BOOL(print_nci_code, false, "print native context independent code.")
 DEFINE_BOOL(trace_turbo_nci, false, "trace native context independent code.")
-DEFINE_BOOL(turbo_collect_feedback_in_generic_lowering, false,
+DEFINE_BOOL(turbo_collect_feedback_in_generic_lowering, true,
             "enable experimental feedback collection in generic lowering.")
 
 // Favor memory over execution speed.