git: openjdk/loom: fibers: Guard clear_extentLocalBindings and set_extentLocalCache with null pointer checks

[duke]

Changeset: d1c5c8c0
Author:    Andrew Haley <aph at redhat.com>
Date:      2022-10-17 14:29:01 +0000
URL:       https://git.openjdk.org/loom/commit/d1c5c8c01c80cdc8879265fabb242f929dafb94e

Guard clear_extentLocalBindings and set_extentLocalCache with null pointer checks

! src/hotspot/share/classfile/javaClasses.cpp
! src/hotspot/share/oops/oopHandle.hpp
! src/hotspot/share/runtime/javaThread.cpp