Update JVMCI after metropolis repo is updated to latest jdk/jdk.

Ported new changes in graal-jvmci-8:
[GR-14747] NPE in HotSpotMemoryAccessProviderImpl.readNarrowOopConstant().

And cleanup debug code, updated copyright year in modified files, added missing JVMCI::do_unloading() call to G1 code.

Changed JVMCINMethodData::set_nmethod_mirror() to work with JDK-8220343 changes.

Match changes in jaotc/DataPatchProcessor.java to AOT changes:
[GR-13937] Fix JAOTC build