hg: jdk/sandbox: 8237750: Load libzip.so only if necessary

[chris.hegarty at oracle.com]

Changeset: 73a67f19ee67
Author:    minqi
Date:      2020-05-05 15:40 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/73a67f19ee67

8237750: Load libzip.so only if necessary
Summary: libzip.so is unconditionally loaded even without usage. Fix by on demand loading.
Reviewed-by: dlong, iklam, ccheung

! src/hotspot/share/classfile/classLoader.cpp
! src/hotspot/share/classfile/classLoader.hpp
! src/hotspot/share/classfile/classLoader.inline.hpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/mutexLocker.hpp
! test/hotspot/jtreg/serviceability/sa/ClhsdbPmap.java