test: added/fixed risc v opcode tests #779

Job	Run time
risc_v_tests_delegations	37s
tests	1m 3s
build_cli_no_verifiers_512	4m 12s
ISA tests for simulator	43s
full_recursion_fast	2m 12s
build_verifier	4m 59s
build_cli_no_verifiers	2m 44s
circuits_generated	2m 29s
cargo fmt	24s
build_cli_with_verify	59s
basic_example	3m 50s
delegation_example	5m 16s
large_example	4m 52s
verification_example	8m 46s
full_recursion	3m 37s
oh_bender_incremental_proofs	1m 33s
	48m 16s

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