lightclient <14004106+lightclient at users.noreply.github.com>
eip-4750: note the gas cost of callf and retf (#5888)
* eip-4750: note the gas cost of callf and retf
* change callf to 5 gas and retf to 3
Co-authored-by: Alex Beregszaszi <alex@rtfs.hu>