hg: jdk/sandbox: 8191521: handle long relative path specified in -Xbootclasspath/a on windows

[chris.hegarty at oracle.com]

Changeset: ed5e399d967d
Author:    rschmelter
Date:      2019-10-01 14:09 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/ed5e399d967d

8191521: handle long relative path specified in -Xbootclasspath/a on windows
Reviewed-by: ccheung, clanger

! src/hotspot/os/windows/os_windows.cpp
! test/hotspot/gtest/runtime/test_os_windows.cpp
! test/hotspot/jtreg/runtime/LoadClass/LongBCP.java