[PATCH] loongarch: support new -mabi= and -mfpu= values

[Xi Ruoyao]

On Sun, 2021-11-28 at 07:58 +0800, Xi Ruoyao wrote:
> LoongArch Toolchain Conventions [1] has updated the definition of -mabi
> and -mfpu.  Now the GCC port for LoongArch [2] under reviewing has already
> adapted for those changes, and fails to build with current binutils.
> 
> [1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-toolchain-conventions-EN.html
> [2]: https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585555.html

Please ignore my noise: there is already
https://github.com/loongson/binutils-gdb/commit/aacb0bf860f02aa5a7dcb76dd0e392bf871c7586
(which will be submitted here soon).  I somehow didn't find it...