Revert "Reland "[ptr-compr][arm64] Temporarily enable pointer compression on arm64""

This reverts commit d1a4706a.

Reason for revert: Experiment over.

Original change's description:
> Reland "[ptr-compr][arm64] Temporarily enable pointer compression on arm64"
> 
> This is a reland of f5611402
> 
> Original change's description:
> > [ptr-compr][arm64] Temporarily enable pointer compression on arm64
> >
> > ... and make sure that the arm64 ptr-compr bots proceed testing V8 without
> > pointer compression in order to keep testing the other config.
> >
> > Commented out the 'extra' variant since it was crashing. Opened a bug
> > regarding that: https://bugs.chromium.org/p/v8/issues/detail?id=9568
> >
> > Similar to x64's https://chromium-review.googlesource.com/c/v8/v8/+/1607654
> >
> > Bug: v8:7703
> > Change-Id: Ifd46b029bab34524f9f536dcdbd1574f2ddcbf37
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1724216
> > Reviewed-by: Tamer Tas <tmrts@chromium.org>
> > Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> > Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#63019}
> 
> Cq-Include-Trybots: luci.v8.try:v8_android_arm64_n5x_rel_ng
> Bug: v8:7703
> Change-Id: I1a82b87bf6db4e6d100aeffc29dae60ba73d8119
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1730998
> Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Tamer Tas <tmrts@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63043}

TBR=machenbach@chromium.org,tmrts@chromium.org,solanes@chromium.org

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

Bug: v8:7703
Change-Id: I86a801d44ad4ea14b1388ad8ca6109cc8a57a7d7
Cq-Include-Trybots: luci.v8.try:v8_android_arm64_n5x_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1746470Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63148}

BUILD.gn

@@ -107,7 +107,7 @@ declare_args() {
   v8_enable_verify_csa = false
 
   # Enable pointer compression (sets -dV8_COMPRESS_POINTERS).
-  v8_enable_pointer_compression = ""
+  v8_enable_pointer_compression = false
   v8_enable_31bit_smis_on_64bit_arch = false
 
   # Sets -dOBJECT_PRINT.
@@ -230,10 +230,6 @@ if (v8_check_microtasks_scopes_consistency == "") {
 if (v8_enable_snapshot_native_code_counters == "") {
   v8_enable_snapshot_native_code_counters = v8_enable_debugging_features
 }
-if (v8_enable_pointer_compression == "") {
-  # TODO(v8:v7703): temporarily enable pointer compression on arm64
-  v8_enable_pointer_compression = v8_current_cpu == "arm64"
-}
 if (v8_enable_shared_ro_heap == "") {
   v8_enable_shared_ro_heap = !v8_enable_pointer_compression && v8_use_snapshot
 }

infra/mb/mb_config.pyl

@@ -369,11 +369,8 @@
     'release_simulate_arm64': [
       'release_bot', 'simulate_arm64'],
     'release_simulate_arm64_pointer_compression': [
-      # TODO(v8:v7703): Make pointer compression bots testing non pointer
-      # compression mode while pointer compression is temporarily enabled
-      # on arm64
       'release_bot', 'simulate_arm64', 'dcheck_always_on',
-      'v8_enable_slow_dchecks', 'v8_disable_pointer_compression'],
+      'v8_enable_slow_dchecks', 'v8_enable_pointer_compression'],
     'release_simulate_arm64_msan': [
       'release_bot', 'simulate_arm64', 'msan'],
     'release_simulate_arm64_msan_minimal_symbols': [
@@ -822,10 +819,6 @@
       'gn_args': 'v8_enable_pointer_compression=true',
     },
 
-    'v8_disable_pointer_compression': {
-      'gn_args': 'v8_enable_pointer_compression=false',
-    },
-
     'v8_enable_test_features': {
       'gn_args': 'v8_enable_test_features=true',
     },

test/mjsunit/mjsunit.status

@@ -790,6 +790,7 @@
   'icu-date-lord-howe': [SKIP],
   'regress/regress-6288': [SKIP],
   # OOM:
+  'regress/regress-748069': [FAIL],
   'regress/regress-752764': [FAIL],
   # Flaky OOM:
   'regress/regress-779407': [SKIP],