[8u20] Request for approval: JDK-8042759 and JDK-8047372

[Vicente-Arturo Romero-Zaldivar]

Hi,

Please approve the back-port of the following fixes from 9 to 8u20:

8042759: Lambda returning implicitly-typed lambdas considered pertinent 
to applicability
     JDK9 bug: https://bugs.openjdk.java.net/browse/JDK-8042759
     JDK8u20 bug: https://bugs.openjdk.java.net/browse/JDK-8047408
     fix: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/340148a26acf


8047372: javac crash with FunctionDescriptorLookupError for invalid 
functional interface
     JDK9 bug: https://bugs.openjdk.java.net/browse/JDK-8038182
     JDK8u20 bug: https://bugs.openjdk.java.net/browse/JDK-8047372
     fix: 
http://hg.openjdk.java.net/jdk9/dev/langtools/rev/f25395823aab<http://hg.openjdk.java.net/jdk9/dev/langtools/rev/340148a26acf>

Thanks,
Vicente