Add xtensa platform to compilation test #432

Job	Run time
build_llvm_libraries / build_llvm_libraries	6s
spec_test_on_qemu (boards/arm/imx6/sabre-6quad/configs/nsh, thumbv7_vfp, dp, -t aot, CONFIG_INTER...	11m 40s
spec_test_on_qemu (boards/arm/imx6/sabre-6quad/configs/nsh, thumbv7_vfp, dp, -t aot -X, CONFIG_IN...	11m 14s
spec_test_on_qemu (boards/arm/imx6/sabre-6quad/configs/nsh, thumbv7_vfp, dp, -t classic-interp, C...	3h 28m 35s
spec_test_on_qemu (boards/arm/imx6/sabre-6quad/configs/nsh, thumbv7_vfp, dp, -t fast-interp, CONF...	3h 29m 2s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh, riscv32, none, -t aot, CONFIG_INTER...	10m 31s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh, riscv32, none, -t aot -X, CONFIG_IN...	10m 47s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh, riscv32, none, -t classic-interp, C...	3h 54m 48s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh, riscv32, none, -t fast-interp, CONF...	3h 51m 53s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh64, riscv64, none, -t aot, CONFIG_INT...	10m 48s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh64, riscv64, none, -t classic-interp,...	3h 49m 40s
spec_test_on_qemu (boards/risc-v/qemu-rv/rv-virt/configs/nsh64, riscv64, none, -t fast-interp, CO...	3h 49m 45s
	23h 18m 49s

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