hg: jdk/sandbox: 8200478: For boxing conversion javac uses Long.valueOf which does not guarantee caching according to its javadoc

[chris.hegarty at oracle.com]

Changeset: 661ef62a6618
Author:    darcy
Date:      2018-04-25 22:12 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/661ef62a6618

8200478: For boxing conversion javac uses Long.valueOf which does not guarantee caching according to its javadoc
Reviewed-by: bpb

! src/java.base/share/classes/java/lang/Long.java
! test/langtools/tools/javac/boxing/BoxingCaching.java