hg: jdk/sandbox: 8198997: Cache normalized/resolved user.dir property

[chris.hegarty at oracle.com]

Changeset: 6712bdd93e4e
Author:    bpb
Date:      2018-03-22 08:41 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/6712bdd93e4e

8198997: Cache normalized/resolved user.dir property
Summary: Normalize cached user.dir property value in constructor (windows only)
Reviewed-by: alanb

! src/java.base/windows/classes/java/io/WinNTFileSystem.java