[PATCH 2/3] Notify LiveRangeEdit of new virtual registers.

[Mark Lacey]

Add a delegate class to MachineRegisterInfo with a single virtual
function, MRI_NoteNewVirtualRegister(). Update LiveRangeEdit to inherit
from this delegate class and override the definition of the callback
with an implementation that tracks the newly created virtual registers.
---
include/llvm/CodeGen/LiveRangeEdit.h       | 11 +++++++++--
include/llvm/CodeGen/MachineRegisterInfo.h | 27 +++++++++++++++++++++++++++
lib/CodeGen/LiveRangeEdit.cpp              | 13 +++++++++++--
lib/CodeGen/MachineRegisterInfo.cpp        |  4 +++-
4 files changed, 50 insertions(+), 5 deletions(-)

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