hg: jdk/sandbox: Fixing bugs in Tree hashing, ignoring unimportant import changes, enhancing tests.

[jan.lahoda at oracle.com]

Changeset: 195cabbabcdf
Author:    jlahoda
Date:      2020-05-07 10:16 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/195cabbabcdf

Fixing bugs in Tree hashing, ignoring unimportant import changes, enhancing tests.

! make/jdk/src/classes/build/tools/depend/Depend.java
! make/jdk/src/classes/build/tools/depend/DependTest.java