Implement unwind rules for non-Intel architectures
To support DWARF-based stack unwinding, a platform needs a few things,
- Valid unwind records in
- Support in the native code generator (by implementing the
- A mapping of register numbers to DWARF register numbers (see
- For unwinding support in the runtime system:
- Unwinding support in
Currently the only platforms that has all of these implemented is x86_64 and i386. Someone should pick up the other platforms.