Bug#1051764: Missing TARGET_OPTION_SAVE/RESTORE on riscv

[Mathieu Malaterre <malat@debian.org>]

Package: gcc-13
Version: 13.2.0-3
Forwarded: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110812
Affects: src:highway

src:highway fails to compile on riscv64 with LTO. Confirmed upstream.