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

[Vaidas Gasiunas]

- An option to turn-off use of the segment set for the computation of the live ranges of physregs.
- Various small changes addressing the comments of Quentin.

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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