[llvm] r297695 - In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled.

[Nirav Davé via llvm-commits]

Can you give me the unreduced test? This one appears to be fine. I suspect
the issue here is that the unreduced test is sufficiently complex that
FindBetterChain gives up and fails to improve the chains of the stores.
leaving the stores in a chain sequence which we won't catch as is.

I have a patch in review that should fix the issue (
https://reviews.llvm.org/D31068) and I've held back on reverting the change
for now.

-Nirav
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