[ARM] GlobalISel: Fix stack-use-after-scope bug.
Summary:
Lifetime extension wasn't triggered on the result of BuildMI because the
reference was non-const. However, instead of adding a const, I've
removed the reference entirely as RVO should kick in anyway.
Reviewers: rovka, bkramer
Reviewed By: bkramer
Subscribers: aemerson, rengolin, dberris, llvm-commits, kristof.beyls
Differential Revision: https://reviews.llvm.org/D29124
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293059
91177308-0d34-0410-b5e6-
96231b3b80d8
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