[PATCH] Prevent the creation of empty location list ranges.

[Frederic Riss]

  - Implement SeenInstructionInRange as a forward_list to guarantee element pointer stability.
  - Add more in depth comment.
  - Rename validateOpenRanges to markOpenRangesNonEmpty.

http://reviews.llvm.org/D6497

Files:
  lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
  lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
  test/DebugInfo/X86/block-capture.ll
  test/DebugInfo/X86/dbg-value-inlined-parameter.ll
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