Revert "Reland "[ptr-compr][x64] Temporarily enable pointer compression on x64""

This reverts commit d61a9347.

Reason for revert: May cause UBSan failures

Original change's description:
> Reland "[ptr-compr][x64] Temporarily enable pointer compression on x64"
>
> This is a reland of 42beed97
>
> Relanding after fixing Chromium issues.
>
> Original change's description:
> > [ptr-compr][x64] Temporarily enable pointer compression on x64
> >
> > ... and make sure that the x64 ptr-compr bots proceed testing V8 without
> > pointer compression in order to keep testing the full pointer mode.
> >
> > Bug: v8:7703
> > Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng,v8_linux64_tsan_rel
> > Change-Id: Iee725deda813425a6f0722948b54976154f50909
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1497139
> > Reviewed-by: Michael Hablich <hablich@chromium.org>
> > Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> > Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#60230}
>
> Bug: v8:7703
> Change-Id: Ib1498609603cb03be2464043658131d5a2f1e012
> Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng,v8_linux64_tsan_rel
> Cq-Include-Trybots: luci.chromium.try:fuchsia_x64,linux-rel,mac-rel
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559850
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61416}

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

Change-Id: I77d8fe848e53cbea4be89429de967a5966ae7e48
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7703
Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng, v8_linux64_tsan_rel
Cq-Include-Trybots: luci.chromium.try:fuchsia_x64, linux-rel, mac-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1606500
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61427}

BUILD.gn

@@ -104,7 +104,7 @@ 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.
@@ -225,11 +225,6 @@ 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 x64
-  v8_enable_pointer_compression = v8_current_cpu == "x64"
-}
-
 assert(v8_current_cpu != "x86" || !v8_untrusted_code_mitigations,
        "Untrusted code mitigations are unsupported on ia32")
 

infra/mb/mb_config.pyl

@@ -454,10 +454,7 @@
       'release_bot', 'x64', 'minimal_symbols'],
     'release_x64_pointer_compression': [
       'release_bot', 'x64', 'dcheck_always_on', 'v8_enable_slow_dchecks',
-      # TODO(v8:v7703): Make pointer compression bots testing non pointer
-      # compression mode while pointer compression is temporarily enabled
-      # on x64
-      'v8_disable_pointer_compression'],
+      'v8_enable_pointer_compression'],
     'release_x64_trybot': [
       'release_trybot', 'x64'],
     'release_x64_test_features_trybot': [
@@ -813,10 +810,6 @@
       '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',
     },