[test] Mark slow test

TBR=mslekova@chromium.org
NOTRY=true

Change-Id: I1a08c5113d461dbd94efd3975705e9844ac2c5f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1605724Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61401}

test/cctest/cctest.status

@@ -122,6 +122,7 @@
   # Slow tests.
   'test-debug/CallFunctionInDebugger': [PASS, ['mode == debug', SLOW]],
   'test-heap-profiler/ManyLocalsInSharedContext': [PASS, SLOW],
+  'test-jump-table-assembler/JumpTablePatchingStress': [PASS, SLOW],
   'test-strings/StringOOM*': [PASS, ['mode == debug', SKIP]],
   'test-serialize/CustomSnapshotDataBlobImmortalImmovableRoots': [PASS, ['mode == debug', SKIP]],
   'test-parsing/ObjectRestNegativeTestSlow': [PASS, ['mode == debug', SKIP]],