ELF: Add a comment to ELFFile::findAtom.
ELF: Add a comment to ELFFile::findAtom.

Also changed the local variable names to avoid line wrapping.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@234281 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld