8007779: os::die() on solaris should generate core file

Reviewed-by: dholmes, rbackman
diff --git a/hotspot/src/os/solaris/vm/os_solaris.cpp b/hotspot/src/os/solaris/vm/os_solaris.cpp
index 389ed9a..2e52bdb 100644
--- a/hotspot/src/os/solaris/vm/os_solaris.cpp
+++ b/hotspot/src/os/solaris/vm/os_solaris.cpp
@@ -1865,7 +1865,7 @@
 
 // Die immediately, no exit hook, no abort hook, no cleanup.
 void os::die() {
-  _exit(-1);
+  ::abort(); // dump core (for debugging)
 }
 
 // unused