Re: [PATCH v3 1/2] LoongArch: Define ISA versions

[Yang Yujie]

v1 -> v2: 
- Fixed build issues of runtime libraries caused by the new header.
- Restored the default ARCH of lp64f/lp64s ABI to "abi-default".

v2 -> v3:
- Fixed libobjc build.
- Modify "LoongArch v1.1 features" to "LoongArch v1.1 instructions"
in invoke.texi.