[fusaka-devnet-2] EIP-7883

[macfarla]

avoid division by zero; return minimum gas cost of max input length is zero

Signed-off-by: Sally MacFarlane macfarla.github@gmail.com

Fixed Issue(s)

fixes 2 referenceTests

TODO

• cherry pick this on top of EIP-7883: adjust modexp gas computation #8766

ExecutionSpecBlockchainTest_65 > execution(String, BlockchainReferenceTestCaseSpec, boolean) > Name: tests/byzantium/eip198_modexp_precompile/test_modexp.py::test_modexp[fork_Osaka-blockchain_test_from_state_test-ModExpInput_base_0x-exponent_0x-modulus_0x-ModExpOutput_returned_data_0x][Osaka] FAILED
    org.opentest4j.AssertionFailedError at ExecutionSpecBlockchainTest_65.java:37

ExecutionSpecStateTest_44 > execution(String, GeneralStateTestCaseEipSpec, boolean) > Name: tests/byzantium/eip198_modexp_precompile/test_modexp.py::test_modexp[fork_Osaka-state_test-ModExpInput_base_0x-exponent_0x-modulus_0x-ModExpOutput_returned_data_0x]-Osaka FAILED
    java.lang.AssertionError at ExecutionSpecStateTest_44.java:37

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