Revert "[regalloc] Enable control-flow aware allocation"

This reverts commit febe3a10.

Reason for revert: Regressions

Original change's description:
> [regalloc] Enable control-flow aware allocation
> 
> We enable this feature to collect performance data; revert at will.
> 
> Bug: v8:9088
> Change-Id: I57cd79707fe56ec5a2d6d5ee65b7ce24bda57773
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1585726
> Auto-Submit: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61117}

TBR=mstarzinger@chromium.org,jarin@chromium.org,sigurds@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:9088, chromium:958623, chromium:958726, chromium:958727
Change-Id: Ib07e9f201f8e35c190717ddb6e81a30bcadb1c07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1593300Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61178}

src/flag-definitions.h

@@ -461,7 +461,7 @@ 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, true,
+DEFINE_BOOL(turbo_control_flow_aware_allocation, false,
             "consider control flow while allocating registers")
 
 DEFINE_STRING(turbo_filter, "*", "optimization filter for TurboFan compiler")