Created by: semihalf-kardach-stanislaw
Add files with arch-specific symbols and definitions required to compile for RISC-V. Those definitions are used in multiple DynamoRIO modules but splitting them across multiple commits would likely involve merge dependencies. Therefore it seemed more straightforward to keep all of the files under core/arch/riscv64 in a single commit.
NOTE: This code is not validated and mostly contains stubs as the main point was to achieve compilation and estimate the effort required for the port. Some of the trivial logic has been implemented though.
Issue: #3544
Signed-off-by: Stanislaw Kardach kda@semihalf.com