[ELF] Simplify compCtors and writeInt.
[ELF] Simplify compCtors and writeInt.

Reviewers: ruiu

Subscribers: emaste, arichardson, llvm-commits

Differential Revision: https://reviews.llvm.org/D44690

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@328009 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld