Avoid some temporary allocations.
Avoid some temporary allocations.

Some system libraries have a lot of versioned symbols. When linking
scylla this brings the number of malloc calls from 49154 to 37944.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@329453 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld