cmd/evm: Allow stdin and files as sources of bytecode (#3172)
cmd/evm: Allow stdin and files as sources of bytecode (#3172)

* cmd/evm: Allow stdin and files as sources of bytecode

* cmd/evm: Print and exit instead of panicing

* cmd/evm: fix compile and vet errors

maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum