hg: jdk/sandbox: 8229899: Make java.io.File.isInvalid() less racy

[chris.hegarty at oracle.com]

Changeset: a445d4305fad
Author:    aeubanks
Date:      2019-08-19 16:08 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/a445d4305fad

8229899: Make java.io.File.isInvalid() less racy
Reviewed-by: alanb, martin, shade

! src/java.base/share/classes/java/io/File.java