Function sunrise_bootstrap::elf_loader::load_segment

fn load_segment(
    page_table: &mut PagingOffPageSet, 
    segment: ProgramHeader, 
    elf_file: &ElfFile
)

Loads an elf segment by coping file_size bytes to the right address, and filling remaining with 0s. This is used by NOBITS sections (.bss), this way we initialize them to 0.