Integrate Google benchmarks into SLEEF #263

Job	Run time
build-native-ubuntu-latest-gcc	3m 5s
build-native-ubuntu-latest-llvm	3m 43s
build-native-ah-ubuntu_22_04-c7g_2x-50-gcc	2m 45s
build-native-ah-ubuntu_22_04-c7g_2x-50-llvm	3m 25s
test-native-ubuntu-latest-gcc	7m 56s
build-armhf-gcc	1m 13s
test-native-ubuntu-latest-llvm	7m 32s
build-armhf-llvm	1m 16s
test-native-ah-ubuntu_22_04-c7g_2x-50-gcc	2m 36s
build-ppc64el-gcc	2m 18s
test-native-ah-ubuntu_22_04-c7g_2x-50-llvm	2m 27s
build-ppc64el-llvm	3m 57s
build-s390x-gcc	1m 42s
build-s390x-llvm	2m 40s
build-riscv64-llvm	2m 25s
test-armhf-gcc (qemu_cpu: "max")	15m 2s
test-armhf-llvm (qemu_cpu: "max")	13m 23s
test-ppc64el-gcc (qemu_cpu: "power10")	26m 27s
test-ppc64el-llvm (qemu_cpu: "power10")	24m 11s
test-s390x-gcc (qemu_cpu: "")	20m 15s
test-s390x-llvm (qemu_cpu: "")	18m 12s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 55s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	29m 46s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	39m 56s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	59m 13s
	5h 8m 20s

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