hg: jdk/sandbox: 8205648: fix for 8205195 breaks secondary error handling

[chris.hegarty at oracle.com]

Changeset: 0fb45c3b185e
Author:    dcubed
Date:      2018-06-26 14:15 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/0fb45c3b185e

8205648: fix for 8205195 breaks secondary error handling
Summary: Only grab Threads_lock in VMError::controlled_crash() when we don't already own it.
Reviewed-by: sspitsyn, stuefe

! src/hotspot/share/utilities/vmError.cpp