[8u20] Request for approval for CR 8042656 - Inference produces spurious error for intersection type bounds check

[Dan Smith]

Please approve this backport of langtools fix JDK-8042656 from 9 to 8u20.

Bug report: https://bugs.openjdk.java.net/browse/JDK-8042656
Changeset: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/e5d0d7510671
jdk9 reviewer: vromero

—Dan