Evm/third

[x-senpai-x]

1)specs_common.go ,specs_optimism.go and specs_default.go: if optimism tag is added then specs_optimism.go is run else specs_default.go . specs_common.go contains the common attributes shared by both files
TxEnv is part of env.go but since it requires optimism tag so it has been. added here. Defines various specifications (specs) for Ethereum network upgrades, with each upgrade associated with a specific SpecId
Note very certain whether this file would run . Changes might be needed
2)optimism.go and non_optimism.go : used for instantiating new handlercfg in handler.go . depends on the flag optimism_default_handler and negate_optimism_default_handler . if both flags present then non_optimism runs . if just negate_optimism_default_handler present then non_optimism runs . if optimism_default_handler and negate_optimism_default_handler disabled then optimism.go runs
3)tables.go : used for spec functions in handler.go
4)host.go : used in handler.go

[x-senpai-x]

just look at 3rd commit specs ,optimism build flag and dependencies for handler