Revert "Fix examples for recent shared_ptrification"
(should've rolled in to this revert of the CompilerInstance change in
the first place... anyway)
This reverts commit r291185.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291252 91177308-0d34-0410-b5e6-96231b3b80d8