The jsCore_mobile task can fail if bypass compile is triggered because the mongoe binary is not generated during compile.

For an example, see:

https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_required_mobile_jsCore_mobile_patch_00f32ac53c595f098ea200ab7b9d7278be4a5193_5ae0cc70c9ec44641fc7335c_18_04_25_18_44_14