Enable this test only when assertions are available.
Enable this test only when assertions are available.

Experimental features are generally not available in non-asserts build,
so narrow this test. Fixes rdar://101494565.

apple/swift,roambotics/swift,apple/swift,apple/swift,apple/swift,apple/swift,roambotics/swift,apple/swift,roambotics/swift,roambotics/swift,roambotics/swift,roambotics/swift