[test] Skip and mark slow tests

TBR=sigurds@chromium.org
NOTRY=true

Bug: v8:7783
Change-Id: I8151fa71b7661be61f4437fdaabe525b31a1915c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1591606Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61208}

test/mjsunit/mjsunit.status

@@ -393,7 +393,10 @@
 
   # These tests check that we can trace the compiler.
   'tools/compiler-trace-flags': [SKIP],
-  'tools/compiler-trace-flags-wasm': [SKIP]
+  'tools/compiler-trace-flags-wasm': [SKIP],
+
+  # Slow with pointer compression.
+  'regress/regress-crbug-319860': [PASS, ['pointer_compression', SLOW]],
 }],  # 'lite_mode or variant == jitless'
 
 ##############################################################################
@@ -930,6 +933,7 @@
 ##############################################################################
 ['variant == stress and (arch == arm or arch == arm64) and simulator_run', {
   # Slow tests: https://crbug.com/v8/7783
+  'es6/classes': [SKIP],
   'generated-transition-stub': [SKIP],
   'regress/regress-336820': [SKIP],
   'wasm/grow-memory': [SKIP],