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Only add `darwin_log_cmd` lit shell test feature when the log can be queried.

Authored by delcypher on Mar 26 2020, 6:17 PM.

Description

Only add darwin_log_cmd lit shell test feature when the log can be queried.

Summary:
Follow up fix to 445b810fbd4. The log show command only works for
privileged users so run a quick test of the command during lit config to
see if the command works and only add the darwin_log_cmd feature if
this is the case.

Unfortunately this means the asan/TestCases/Darwin/duplicate_os_log_reports.cpp
test and any other tests in the future that use this feature won't run
for unprivileged users which is likely the case in CI.

rdar://problem/55986279

Reviewers: kubamracek, yln, dcoughlin

Subscribers: Charusso, #sanitizers, llvm-commits

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D76899