test: added/fixed risc v opcode tests (#159) #781

Job	Run time
ISA tests for simulator	1m 16s
risc_v_tests_delegations	1m 13s
build_cli_with_verify	1m 39s
full_recursion_fast	2m 10s
circuits_generated	2m 38s
tests	2m 26s
build_cli_no_verifiers	3m 40s
cargo fmt	24s
build_verifier	3m 29s
build_cli_no_verifiers_512	2m 29s
large_example	4m 48s
delegation_example	5m 11s
basic_example	2m 45s
verification_example	7m 18s
oh_bender_incremental_proofs	1m 33s
full_recursion	3m 37s
	46m 36s

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