hg: jdk/jdk: 8231287: JMap should do a better job of reporting exception it catches

[chris.plummer at oracle.com]

Changeset: 31524b016783
Author:    cjplummer
Date:      2019-09-28 12:33 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/31524b016783

8231287: JMap should do a better job of reporting exception it catches
Summary: Retrhow any caught exception, and always print exceptions before exiting
Reviewed-by: sspitsyn, phh

! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/tools/JMap.java
! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/tools/Tool.java
! test/jdk/sun/tools/jhsdb/JShellHeapDumpTest.java