[8u20] request for approval to backport JDK-8034127: javac provide debug oriented toString() methods to InferenceContext and UndetVar

[Vicente-Arturo Romero-Zaldivar]

Hi,

Please approve a backport fix for:

JDK-8034127: javac provide debug oriented toString() methods to 
InferenceContext and UndetVar

Bug: https://bugs.openjdk.java.net/browse/JDK-8034127
jdk9 fix: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/06c9978d2891
Patch applies cleanly to: 
http://hg.openjdk.java.net/jdk8u/jdk8u-dev/langtools

Thanks,

Vicente