[ELF] - refactor of code in RelocationSection<ELFT>::writeTo()
[ELF] - refactor of code in RelocationSection<ELFT>::writeTo()

Just a little reformat of 'if' conditions, NFC.

Differential revision: http://reviews.llvm.org/D15453

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@255626 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld