hg: jdk/submit: 8237508: Simplify JarFile.isInitializing

[claes.redestad at oracle.com]

Changeset: c5203b158ec8
Author:    redestad
Date:      2020-01-20 14:24 +0100
URL:       https://hg.openjdk.java.net/jdk/submit/rev/c5203b158ec8

8237508: Simplify JarFile.isInitializing
Reviewed-by: dfuchs, coffeys, lancea

! src/java.base/share/classes/java/util/jar/JarFile.java
! src/java.base/share/classes/java/util/jar/JavaUtilJarAccessImpl.java
! src/java.base/share/classes/jdk/internal/access/JavaUtilJarAccess.java