In the 2 weeks since JDK-8342860 we've had some more backsliding in the use of NULL in HotSpot code. Some of these are NULL in comments that should be null.  Some are NULL in code that should be nullptr.

8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning
./cpu/aarch64/templateInterpreterGenerator_aarch64.cpp
./cpu/riscv/templateInterpreterGenerator_riscv.cpp 
./cpu/x86/templateInterpreterGenerator_x86.cpp 

8331497: Implement JEP 483: Ahead-of-Time Class Loading & Linking
./share/cds/metaspaceShared.cpp 
./share/oops/constantPool.cpp -- 2 occurrences

8305895: Implement JEP 450: Compact Object Headers (Experimental)
./share/cds/archiveUtils.hpp 

8229278: Improve print_location for invalid heap pointers
./share/gc/shared/locationPrinter.inline.hpp