[Coverage] Avoid unnecessary copying of std::vector

Approved by: Justin Bogner <mail@justinbogner.com>

Differential Revision: http://reviews.llvm.org/D18756


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266284 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed