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CodeGen: Add/Factor out LiveRegUnits class; NFCI

Description

CodeGen: Add/Factor out LiveRegUnits class; NFCI

This is a set of register units intended to track register liveness, it
is similar in spirit to LivePhysRegs.
You can also think of this as the liveness tracking parts of the
RegisterScavenger factored out into an own class.

This was proposed in http://llvm.org/PR27609

Differential Revision: http://reviews.llvm.org/D21916

Details

Committed
matzeJan 19 2017, 4:16 PM
Differential Revision
D21916: Add LiveRegUnits class.
Parents
rL292541: Fix demangle helper after r286788
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