[regalloc] Enable control-flow aware allocation

R=neis@chromium.org

Bug: v8:9088
Change-Id: I869e3b3b5426bbf0097096f5819a4debd91afcf0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1844782Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64155}

src/flags/flag-definitions.h

@@ -501,7 +501,7 @@ DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points")
 DEFINE_BOOL(opt, true, "use adaptive optimizations")
 DEFINE_BOOL(turbo_sp_frame_access, false,
             "use stack pointer-relative access to frame wherever possible")
-DEFINE_BOOL(turbo_control_flow_aware_allocation, false,
+DEFINE_BOOL(turbo_control_flow_aware_allocation, true,
             "consider control flow while allocating registers")
 
 DEFINE_STRING(turbo_filter, "*", "optimization filter for TurboFan compiler")