Improve vector reg support on s390x (#279) #65

Job	Run time
build-test-on-aarch64	1m 38s
build-test-on-arm32	2m 4s
build-test-on-armt2	2m 2s
build-test-on-loongarch64	1m 48s
build-test-on-riscv32	3m 4s
build-test-on-riscv64	2m 24s
build-test-on-riscv32-extensions	2m 36s
build-test-on-riscv64-extensions	2m 26s
build-test-on-s390x	2m 3s
build-test-on-x64	16s
build-test-on-x86	31s
	20m 52s

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