s/vector/std::vector/

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@210014 91177308-0d34-0410-b5e6-96231b3b80d8
Run clang-format.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@210015 91177308-0d34-0410-b5e6-96231b3b80d8