[PATCH] Generic support for sub/super registers in AsmPrinter::EmitDwarfRegOp()

[Adrian Prantl]

Earlier this week (r201190) I added generic support for super-registers in AsmPrinter::EmitDwarfRegOp(). This patch does the opposite, by substituting multiple sub-registers for super-registers without valid DWARF numbers. The result is general enough that we can get rid of ARMAsmPrinter::EmitDwarfRegOp().

While I think this patch is rather uncontroversial; it is removing code, so I’m posting this for review first.

thanks,
adrian

PS: these two patches also from the basis for the updated revision of http://llvm-reviews.chandlerc.com/D2680 I just uploaded.
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