ppc[turboshaft]: mark CombineCompare tests as slow on simulator

Change-Id: I9f3dedf5756e17f5bb003c7846dc41e434002364
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5503356
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Reviewed-by: Darius Mercadier <dmercadier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#93666}

test/cctest/cctest.status

@@ -459,6 +459,8 @@
   'test-api/Threading*': [PASS, SLOW],
   'test-api/ExternalArrays': [PASS, SLOW],
   'test-debug/DebugBreakStackTrace': [PASS, SLOW],
+  'turboshaft-test-compare-combine/CombineCompareWord64Logic1': [PASS, SLOW],
+  'turboshaft-test-compare-combine/CombineCompareTwoLogicInputs': [PASS, SLOW],
 
 }],  # 'arch == ppc64 and simulator_run'