hg: jdk/jdk: 8210235: JvmtiTrace::safe_get_current_thread_name is unsafe in debug builds

[kim.barrett at oracle.com]

Changeset: 36773a4fe3e7
Author:    kbarrett
Date:      2018-08-31 16:29 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/36773a4fe3e7

8210235: JvmtiTrace::safe_get_current_thread_name is unsafe in debug builds
Summary: Use Thread::current_or_null and handle NULL result.
Reviewed-by: coleenp

! src/hotspot/share/prims/jvmtiTrace.cpp