[PATCH 1/5] refactor LiveInterval: introduce new LiveRanges class

[Matthias Braun]

LiveRanges has logic to manage a set list LiveRange instances
and a list of value numbers which previously was in LiveInterval,
without having details like spill weight or a fixed register number.
LiveInterval is now a direct subclass of LiveRanges and simply adds the
spill weight and the register number.
---
 include/llvm/CodeGen/LiveInterval.h  | 143 +++++++++++++++++++++--------------
 lib/CodeGen/LiveInterval.cpp         | 128 +++++++++++++++----------------
 lib/CodeGen/LiveIntervalAnalysis.cpp |  20 ++---
 3 files changed, 156 insertions(+), 135 deletions(-)

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