Fix RETURN_ADDR_RTX regression. Force LR save if we are using __builtin_return_addr
Merge pull request #4 from blueCommand/stage-upstream

Fix RETURN_ADDR_RTX regression.
Force LR save if we are using __builtin_return_addr.
TLS import from other branch
Merge branch 'tls' of github.com:blueCommand/or1k-gcc into tls