Davide Italiano e677c7bd22 [Target/ARM] Only enable OptimizeBarrierPass at -O1 and above. ...

Ideally this is going to be and LLVM IR pass (shared, among others
with AArch64), but for the time being just enable it if consumers
ask us for optimization and not unconditionally.

Discussed with Tim Northover on IRC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237837 91177308-0d34-0410-b5e6-96231b3b80d8

2015-05-20 21:40:38 +00:00

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