[PATCH] D16138: Correct setting of UserLabelPrefix for MCU target

[Rafael Ávila de Espíndola via cfe-commits]

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This revision is now accepted and ready to land.

LGTM, but could you change the default in a followup commit? TargetInfo should really be setting it to "" since it is far more common than "_".


http://reviews.llvm.org/D16138