Set proper assembler arch for MIPS64
Set proper assembler arch for MIPS64

Signed-off-by: Jiaxun Yang <accc0069bb3ff62ae1a181f9cf05aee7ddbd8eff@flygoat.com>

xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS,xianyi/OpenBLAS