hg: jdk/sandbox: Fix repeated imports

[magnus.ihse.bursie at oracle.com]

Changeset: 5ec2849c47fd
Author:    ihse
Date:      2020-04-15 09:12 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/5ec2849c47fd

Fix repeated imports

! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/code/MethodHandlesAdapterBlob.java
! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/InstanceKlass.java
! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/GenericGrowableArray.java