hg: amber/amber: Add nesting combinator for Extractor

[brian.goetz at oracle.com]

Changeset: cb7760bcb5b5
Author:    briangoetz
Date:      2018-10-29 15:12 -0400
URL:       http://hg.openjdk.java.net/amber/amber/rev/cb7760bcb5b5

Add nesting combinator for Extractor

! .hgignore
! src/java.base/share/classes/java/lang/compiler/Extractor.java
! src/java.base/share/classes/java/lang/compiler/ExtractorImpl.java
! test/jdk/java/lang/compiler/ExtractorTest.java
+ test/jdk/java/lang/compiler/RecordTest.java