[ELF] Use type helper Elf_Word instead of plain uint32_t data type
[ELF] Use type helper Elf_Word instead of plain uint32_t data type

That helps to correctly write content of hash table if target and host
endianness are not the same. Right now that commit does not affect
any supported targets.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@234928 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld