hg: jdk9/sandbox/jdk: 8177969: Faster FilePermission::implies by avoiding the use of Path::relativize

[chris.hegarty at oracle.com]

Changeset: cd268728d178
Author:    weijun
Date:      2017-04-11 10:12 +0800
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/cd268728d178

8177969: Faster FilePermission::implies by avoiding the use of Path::relativize
Reviewed-by: rriggs, mullan

! src/java.base/share/classes/java/io/FilePermission.java
! test/java/io/FilePermission/Correctness.java