[8u] request for approval: 8066974: Compiler doesn't infer method's generic type information in lambda body

[Maurizio Cimadamore]

Hi,
Please review the backport of bug:

JDK-8066974: Compiler doesn't infer method's generic type information in 
lambda body

JDK9 bug: https://bugs.openjdk.java.net/browse/JDK-8066974
original patch pushed to 9: 
http://hg.openjdk.java.net/jdk9/dev/langtools/rev/c402b2856ed1
backport bug: https://bugs.openjdk.java.net/browse/JDK-8142883
public review: http://cr.openjdk.java.net/~mcimadamore/8066974/

All relevant tests pass.

Thanks,
Maurizio