[AArch64] AArch64LoadStoreOptimizer: fix bug in pre-inc check iterator
Summary:
Fix case where a pre-inc/dec load/store would not be formed if the
add/sub that forms the inc/dec part of the operation was the first
instruction in the block being examined.
Reviewers: mcrosier, jmolloy, t.p.northover, junbuml
Subscribers: aemerson, rengolin, mcrosier, llvm-commits
Differential Revision: http://reviews.llvm.org/D16785
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260275
91177308-0d34-0410-b5e6-
96231b3b80d8
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