hg: jdk9/dev/langtools: 8075509: List.map should return itself if list is unchanged

[maurizio.cimadamore at oracle.com]

Changeset: 8819ec2a8246
Author:    mcimadamore
Date:      2015-03-19 16:23 +0000
URL:       http://hg.openjdk.java.net/jdk9/dev/langtools/rev/8819ec2a8246

8075509: List.map should return itself if list is unchanged
Summary: Fix List.map to match semantics of old Type.map
Reviewed-by: jlahoda

! src/jdk.compiler/share/classes/com/sun/tools/javac/util/List.java