[PATCH] Change representation of instruction ranges where variable is accessible.

[Alexey Samsonov]

Hi dblaikie,

Use more straightforward way to represent the set of instruction
ranges where the location of a user variable is defined - vector of pairs
of instructions (defining start/end of each range),
instead of a flattened vector of instructions where some instructions
are supposed to start the range, and the rest are supposed to "clobber" it.

Simplify the code which generates actual .debug_loc entries.

No functionality change.

http://reviews.llvm.org/D3861

Files:
  lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
  lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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