rumtime_loader: fix TLS for riscv64

Change-Id: I55593dea936af31135b8e9159f8b6a64270369c0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5157
Reviewed-by: X512 <danger_mail@list.ru>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

runtime_loader: implement relocations for riscv64

Change-Id: I98f179fefd8bb732aa04b52aeb59c7b4d0620c05
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3985
Reviewed-by: X512 <danger_mail@list.ru>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

riscv32/64: Stub out some core architecture code

Change-Id: I437dff816e87ec5692cca0aaacaada27b43089ee