[AArch64][Falkor] Fix bug in falkor prefetcher fix pass.

Summary:
In rare cases, loads that don't get prefetched that were marked as
strided loads could cause a crash if they occurred in a loop with other
colliding loads.

Reviewers: mcrosier

Subscribers: aemerson, rengolin, javed.absar, kristof.beyls

Differential Revision: https://reviews.llvm.org/D38261

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314252 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed