[8u20] Request for approval for CR 8033718 - Inference ignores capture variable as upper bound

[Dan Smith]

Please approve this backport of langtools fix JDK-8033718 from 9 to 8u20.

Bug report: https://bugs.openjdk.java.net/browse/JDK-8033718
Changeset: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/54a460e0ac76
jdk9 reviewer: vromero

—Dan