[PATCH] Speed up creation of live ranges for physical registers by using a segment set

[Vaidas Gasiunas]

- Implementations of createDeadDef, extendInBlock, addSegment are templatized to make them reusable for the segment set and the segment vector.
- The segment set is now created in LiveRange constructor, and flushSegmentSet is called in computeRegUnitRange
- Comments regarding coding style are addressed

http://reviews.llvm.org/D6013

Files:
  include/llvm/CodeGen/LiveInterval.h
  include/llvm/CodeGen/LiveIntervalAnalysis.h
  lib/CodeGen/LiveInterval.cpp
  lib/CodeGen/LiveIntervalAnalysis.cpp
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