[llvm-commits] patch: the default argument to "dmb" is "sy"

[Nick Lewycky]

The attached patch changes ARM MC to accept "dmb" and assemble it as "dmb
sy". According to this page:

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/CIHGHHIE.html
that's the right thing to do.

Please review!

Nick
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