Re-marking two tests as SLOW

Bug: v8:6949
Change-Id: If147de926cdc0b03f1bba17974edfce21d7fb256
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1897887Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64747}

test/cctest/cctest.status

@@ -167,6 +167,7 @@
   # Pass but take too long with the simulator.
   'test-api/ExternalArrays': [PASS, SLOW],
   'test-api/Threading*': [SKIP],
+  'test-debug/DebugBreakStackTrace': [PASS, SLOW],
 }],  # 'arch == arm64 and simulator_run'
 
 ##############################################################################

test/mjsunit/mjsunit.status

@@ -501,6 +501,11 @@
   'regress/regress-779407': [PASS, SLOW, NO_VARIANTS],
 }],  # 'arch == arm64'
 
+##############################################################################
+['arch == arm64 and simulator_run', {
+  'regress/regress-454725': [PASS, SLOW],
+}],  # 'arch == arm64 and simulator_run'
+
 ##############################################################################
 ['arch == arm64 and mode == debug and simulator_run', {