Perf: ModExp precompiles extremely slow

[chirag-parmar]

Description

https://github.com/NethermindEth/gas-benchmarks reveal nimbus ModExp precompiles perform really badly. Below screenshot is a comparison against other clients.

Dashboard Link: https://grafana.observability.ethpandaops.io/d/feo4ronhsqv40d/opcodes-benchmarking?orgId=1&from=now-6h&to=now&timezone=browser&var-posgreSQL=benuragv7iuwwb&var-ClientName=$__all&var-TestTitle=EcAdd%20with%20%280,%200%29&var-TestTitle=EcAdd%20with%20%281,%202%29&var-TestTitle=EcAdd%20with%2032-byte%20coordinates&var-TestTitle=EcAdd12CACHABLE&var-TestTitle=EcAdd32ByteCoordinatesCACHABLE&var-TestTitle=EcAddMarius1&refresh=auto

[jangko]

possibly duplicate of #1584