Use SmallVector when we can instead of std::vector.

This looks like it had a small, but measurable performance improvement on -O0
compile time for our ObjC tests.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150208 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed