Use emplace_back to replace size() and resize().

Summary: This speeds-up thin-link for ~29% for large programs.

Reviewers: tejohnson

Reviewed By: tejohnson

Subscribers: grandinj, sanjoy, llvm-commits

Differential Revision: https://reviews.llvm.org/D35145

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307543 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed