hg: jdk/jdk13: 8223794: applications/kitchensink/Kitchensink.java crash bad oop with Graal

[vladimir.kozlov at oracle.com]

Changeset: 8892555795cd
Author:    kvn
Date:      2019-06-20 10:32 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk13/rev/8892555795cd

8223794: applications/kitchensink/Kitchensink.java crash bad oop with Graal
Summary: added new nmethod::oop_at_phantom() method for JVMCI to notify GC that oop should be kept alive
Reviewed-by: dlong, eosterlund

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/code/nmethod.hpp
! src/hotspot/share/jvmci/jvmciCompilerToVM.cpp
! src/hotspot/share/jvmci/jvmciRuntime.cpp
! src/hotspot/share/jvmci/jvmciRuntime.hpp