core/vm, params: implement EIP 3541

core/vm/errors.go

@@ -34,6 +34,7 @@ var (
 	ErrWriteProtection          = errors.New("write protection")
 	ErrReturnDataOutOfBounds    = errors.New("return data out of bounds")
 	ErrGasUintOverflow          = errors.New("gas uint64 overflow")
+	ErrInvalidCode              = errors.New("invalid code: must not begin with 0xef")
 )
 
 // ErrStackUnderflow wraps an evm error when the items on the stack less