[arm64][ptr-compr] Mark some Arm64 sim pointer compression tests as slow

They were timeouting, e.g
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20-%20arm64%20-%20sim%20-%20pointer%20compression/2193

Change-Id: Icf3fcde15510cbdefcd2da8e66530c589f4423f1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1762008
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63267}

test/mjsunit/mjsunit.status

@@ -498,6 +498,9 @@
 
   # BUG(v8:9256). Slow with pointer compression.
   'regress/regress-708247': [PASS, ['pointer_compression', SLOW]],
+  'es6/array-concat': [PASS, ['pointer_compression', SLOW]],
+  'non-extensible-array-reduce': [PASS, ['pointer_compression', SLOW]],
+  'regress/regress-454725': [PASS, ['pointer_compression', SLOW]],
 }],  # 'arch == arm64'
 
 ['arch == arm64 and mode == debug and simulator_run', {