Add preliminary cpu autodetection for Zen5/5c #479

Job	Run time
TEST (LOONGSONGENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSONGENERIC)	7m 31s
TEST (LOONGSONGENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSONGENERIC)	7m 31s
TEST (LOONGSON3R5, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON3R5)	7m 13s
TEST (LOONGSON3R5, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON3R5)	7m 13s
TEST (LOONGSON2K1000, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON2K1000)	6h 0m 13s
TEST (LOONGSON2K1000, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON2K1000)	10m 51s
TEST (LA64_GENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA64_GENERIC)	7m 1s
TEST (LA64_GENERIC, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA64_GENERIC)	7m 1s
TEST (LA464, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA464)	6m 59s
TEST (LA464, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA464)	6m 59s
TEST (LA264, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA264)	7m 18s
TEST (LA264, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA264)	7m 18s
TEST (DYNAMIC_ARCH, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=GENERIC)	14m 1s
TEST (DYNAMIC_ARCH, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=GENERIC)	14m 1s
	7h 51m 10s

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