i#4571: Ignore drcachesim delay-simple failure (#4578)
i#4571: Ignore drcachesim delay-simple failure (#4578)

Ignore failure in tool.drcachesim.delay-simple test on AArch64 to unblock various PRs. 

Confirmed locally that this test started failing at 893c06c2605eb8423ef4a4b33185d0fef9c75257; the failure didn't show up on the Jenkins test suite for PR #4491 somehow.

Issue: #4571
AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio