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

This reverts commit ca1259fc.

Reason for revert: Branch was cut and we don't want the flag flip shipping.

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.
> 
> Bug: v8:7703
> Change-Id: I0017345273d5328d95a338064dd80b44974c1c53
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1844780
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64132}

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

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

Bug: v8:7703
Change-Id: I67c244e583893bb1062dbaa610c9c470fbfb9e40
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1868610Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64374}

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.
@@ -202,11 +202,6 @@ declare_args() {
   v8_enable_regexp_interpreter_threaded_dispatch = true
 }
 
-if (v8_enable_pointer_compression == "") {
-  # TODO(v8:v7703): temporarily enable pointer compression on arm64
-  v8_enable_pointer_compression = v8_current_cpu == "arm64"
-}
-
 # Toggle pointer compression for correctness fuzzing when building the
 # clang_x64_pointer_compression toolchain. We'll correctness-compare the
 # default build with the clang_x64_pointer_compression build.

infra/mb/mb_config.pyl

@@ -365,7 +365,7 @@
       'release_bot', 'simulate_arm64'],
     'release_simulate_arm64_pointer_compression': [
       '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': [
@@ -792,10 +792,6 @@
       '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

@@ -804,6 +804,7 @@
   'icu-date-lord-howe': [SKIP],
   'regress/regress-6288': [SKIP],
   # OOM:
+  'regress/regress-748069': [FAIL],
   'regress/regress-752764': [FAIL],
   # Flaky OOM:
   'regress/regress-779407': [SKIP],