Implement compressed arithmetic instructions for RISCV #121

Job	Run time
build-test-on-aarch64	1m 38s
build-test-on-armt2	2m 52s
build-test-on-loongarch64	2m 30s
build-test-on-arm32	2m 53s
build-test-on-riscv32	3m 11s
build-test-on-riscv32-extensions	2m 48s
build-test-on-riscv64	2m 29s
build-test-on-riscv64-extensions	2m 14s
build-test-on-s390x	2m 57s
build-test-on-x64	19s
build-test-on-x86	59s
	24m 50s

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