Use microarchitecture name instead of meaningless strings to name the core, the legacy core is still retained. 1. Rename LOONGSONGENERIC to LA64_GENERIC 2. Rename LOONGSON3R5 to LA464 3. Rename LOONGSON2K1000 to LA264
1. Use getauxval instead of cpucfg to test hardware capability. 2. Remove unnecessary code and option for compiler check in c_check.