[8u] Request for approval: 8029852/8029725 javac: local class instantiation inside lambda contained in class (2 issues) javac crash and bad code when capturing

[Robert Field]

Please approve this direct backport from jdk9/dev to jdk8u/jdk8u-dev.

Issue: 
<https://bugs.openjdk.java.net/browse/JDK-8036942>https://bugs.openjdk.java.net/browse/JDK-8029852
Issue: 
<https://bugs.openjdk.java.net/browse/JDK-8036942>https://bugs.openjdk.java.net/browse/JDK-8029725
jdk9 changeset: 
http://hg.openjdk.java.net/jdk9/dev/langtools/rev/689266bbcd6a

Reviewers: vromero, jlahoda, dlsmith