[PATCH 4/5] work on LiveRanges instead of LiveInterval where possible

[Matthias Braun]

Also change some pointer arguments to references at some places where
0-pointers are not allowed.
---
 include/llvm/CodeGen/LiveIntervalAnalysis.h | 22 ++++++------
 lib/CodeGen/LiveIntervalAnalysis.cpp        | 14 ++++----
 lib/CodeGen/LiveRangeCalc.cpp               | 56 ++++++++++++++---------------
 lib/CodeGen/LiveRangeCalc.h                 | 32 ++++++++---------
 lib/CodeGen/RegisterCoalescer.cpp           |  2 +-
 lib/CodeGen/SplitKit.cpp                    | 18 +++++-----
 6 files changed, 69 insertions(+), 75 deletions(-)

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