[PATCH] LowerBitSets: Align referenced globals.

[Kostya Serebryany]

This also deserves to be mentioned in the design document clang.llvm.org/docs/ControlFlowIntegrityDesign.html
(probably create a section "Optimisations")
Since this is a security feature, we want to make sure that the security researchers who compare
the design document with the actual generated code are not surprised.


http://reviews.llvm.org/D7873

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