hg: amber/amber: fixing assertion during parsing

[vicente.romero at oracle.com]

Changeset: 531a0335dc49
Author:    vromero
Date:      2018-10-01 16:54 -0700
URL:       http://hg.openjdk.java.net/amber/amber/rev/531a0335dc49

fixing assertion during parsing

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Lower.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
! src/jdk.compiler/share/classes/com/sun/tools/javac/tree/JCTree.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/tree/TreeMaker.java
! test/langtools/tools/javac/concise_methods/ConciseMethodsNegTest01.java
! test/langtools/tools/javac/concise_methods/ConciseMethodsNegTest01.out