RFR(S): 8240676: Meet not symmetric failure when running lucene on jdk8

[Roland Westrelin]

> Wow, it is nice reduction in changed code. Looks good to me.

Thanks for the review.

> What execution time now for compiler/types/TestMeetIncompatibleInterfaceArrays.java test?

1.5 second. 1 second without the patch. 10 minutes with the initial
patch.

Roland.