hg: jdk/sandbox: Fix BlockTree::find_closest_fit and add test

[thomas.stuefe at gmail.com]

Changeset: e1df0dbc7cc9
Author:    stuefe
Date:      2020-09-02 13:21 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e1df0dbc7cc9

Fix BlockTree::find_closest_fit and add test

! src/hotspot/share/memory/metaspace/msBlockTree.hpp
! test/hotspot/gtest/metaspace/test_blocktree.cpp