hg: jdk/sandbox: 8220657: JFR.dump does not work when filename is set

[chris.hegarty at oracle.com]

Changeset: bd613b97c7c8
Author:    egahlin
Date:      2019-06-13 12:27 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/bd613b97c7c8

8220657: JFR.dump does not work when filename is set
Reviewed-by: ysuenaga

! src/jdk.jfr/share/classes/jdk/jfr/internal/PlatformRecording.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdDump.java
+ test/jdk/jdk/jfr/jcmd/TestJcmdDumpWithFileName.java