[Bug target/118356] RISC-V: -falign-labels=0 should (probably) default to 4

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118356

--- Comment #5 from Andreas Schwab <sch...@linux-m68k.org> ---
There are jump_align and loop_align members in the struct riscv_tune_param
which set the defaults for -falign-jumps and -falign-loops, but nothing sets
them to non-NULL yet.