[MachineOutliner] Add optsize markings to outlined functions.

It doesn't matter much this late in the pipeline, but one place that
does check for it is the function alignment code.

Differential Revision: https://reviews.llvm.org/D46373



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332415 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed