[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/+/1844780Reviewed-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}

BUILD.gn

@@ -107,7 +107,7 @@ declare_args() {
   v8_enable_verify_csa = false
 
   # Enable pointer compression (sets -dV8_COMPRESS_POINTERS).
-  v8_enable_pointer_compression = false
+  v8_enable_pointer_compression = ""
   v8_enable_31bit_smis_on_64bit_arch = true
 
   # Sets -dOBJECT_PRINT.
@@ -202,6 +202,11 @@ 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_enable_pointer_compression'],
+      'v8_enable_slow_dchecks', 'v8_disable_pointer_compression'],
     'release_simulate_arm64_msan': [
       'release_bot', 'simulate_arm64', 'msan'],
     'release_simulate_arm64_msan_minimal_symbols': [
@@ -784,6 +784,10 @@
       '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

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