8252685: APIs that require JavaThread should take JavaThread arguments

Reviewed-by: coleenp, sspitsyn, kvn, iklam

src/hotspot/share/prims/jvmtiExport.cpp

@@ -2687,7 +2687,7 @@ jint JvmtiExport::load_agent_library(const char *agent, const char *absParam,
       delete agent_lib;
     } else {
       // Invoke the Agent_OnAttach function
-      JavaThread* THREAD = JavaThread::current();
+      JavaThread* THREAD = JavaThread::current(); // For exception macros.
       {
         extern struct JavaVM_ main_vm;
         JvmtiThreadEventMark jem(THREAD);