Use unique_ptr to hold AsmInfo,MRI,MII,STI

Reviewers: pcc, dblaikie

Reviewed By: dblaikie

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D52389

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342945 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed