Revert "[ScopedNoAliasAA] Remove an unneccesary set"

This reverts commit r278641.  I'm not sure why but this has upset the
multistage builders...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278644 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed