MIPS: Support binutils configured with --enable-mips-fix-loongson3-llsc=yes

MIPS: Support binutils configured with --enable-mips-fix-loongson3-llsc=yes

Forwarded: https://lore.kernel.org/linux-mips/20210109193048.478339-1-aurelien@aurel32.net/T/#u

From version 2.35, binutils can be configured with
--enable-mips-fix-loongson3-llsc=yes, which means it defaults to
-mfix-loongson3-llsc. This breaks labels which might then point at the
wrong instruction.

The workaround to explicitly pass -mno-fix-loongson3-llsc has been
added in Linux version 5.1, but is only enabled when building a Loongson
64 kernel. As vendors might use a common toolchain for building Loongson
and non-Loongson kernels, just move that workaround to
arch/mips/Makefile. At the same time update the comments to reflect the
current status.

Cc: stable@vger.kernel.org # 5.1+
Cc: YunQiang Su <syq@debian.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Gbp-Pq: Topic bugfix/mips
Gbp-Pq: Name mips-support-binutils-configured-with-enable-mips-fi.patch