[PATCH] [GlobalMerge] Take into account minsize attribute of global users' parents.

[Ahmed Bougacha]

Thanks Quentin, r239087.

For the record, I also changed the OnlyOptimizeForSize -O<3 check to be overridden by the debugging flags (-aarch64/-arm-global-merge), to keep it easy to get the "just enable GM" behavior.

-Ahmed


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http://reviews.llvm.org/D10054

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