RFR 8140267: assert(is_native_ptr || alias_type->adr_type() == TypeOopPtr::BOTTOM || alias_type->field() != __null || alias_type->element() != __null) failed: field, array element or unknown

[Dean Long]

https://bugs.openjdk.java.net/browse/JDK-8140267
http://cr.openjdk.java.net/~dlong/8140267/webrev/

8136473 caused lots of failures in nightly testing, so we need to back 
it out.

dl