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Some targets, PowerPC for example, have pseudo-registers (such as that used to represent the rounding mode), that don't have DWARF register numbers or a register class. These are used only for internal dependency tracking, and should not appear in the recorded live-outs. This adds a callback allowing the target to pre-process the live-out mask in order to remove these kinds of registers so that the StackMaps code does not complain about them and/or attempt to include them in the output. This will be used by the PowerPC target in a future commit. llvm-svn: 225805
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