GCC Copyright Assignment Forms for the RISC-V Port

[Palmer Dabbelt]

Andrew and I maintain various GNU toolchain forks that contains a port to the
RISC-V architecture <http://riscv.org>.  We're finishing up the binutils
upstreaming process and would like to submit patches to GCC.  When I signed the
copyright assignment for binutils I was told that the GCC process was
different.  GCC's contributing page

  https://gcc.gnu.org/contribute.html

suggests I send email here to get the GCC copyright assignment forms.  Andrew
and I would both like to sign the forms for past and future changes, and SiFive
(Andrew's employer) will need the employer disclaimer if it's different than
the binutils one.

Thanks!