git: openjdk/jdk: 8254671: ZGC: Remove unused roots iterator types

[Per Liden]

Changeset: 6fe209b5
Author:    Per Liden <pliden at openjdk.org>
Date:      2020-10-13 13:40:50 +0000
URL:       https://git.openjdk.java.net/jdk/commit/6fe209b5

8254671: ZGC: Remove unused roots iterator types

Reviewed-by: stefank

! src/hotspot/share/gc/z/zRootsIterator.cpp
! src/hotspot/share/gc/z/zRootsIterator.hpp