hg: amber/amber: NPE when a method reference qualifier is a method call

[vicente.romero at oracle.com]

Changeset: ad90da891ae0
Author:    vromero
Date:      2018-10-02 10:34 -0700
URL:       http://hg.openjdk.java.net/amber/amber/rev/ad90da891ae0

NPE when a method reference qualifier is a method call

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Lower.java
+ test/langtools/tools/javac/concise_methods/NPEQualifierIsCall.java