Add support for clang from XCode 9 in macOS
Add support for clang from XCode 9 in macOS

Change-Id: Ib636deee77471e60c02e90028a0e5cc0f303b45a
Reviewed-on: http://gerrit.cloudera.org:8080/8119
Reviewed-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>
Tested-by: Kudu Jenkins
Reviewed-by: David Ribeiro Alves <dbbafdb4f25eb0c1ff3facf0e5f2f27705055af1@gmail.com>

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