[PATCH] [DWARF] Fix a few corner cases in expression emission

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10302

Files:
  llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  llvm/trunk/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
  llvm/trunk/lib/CodeGen/AsmPrinter/DwarfExpression.h
  llvm/trunk/test/DebugInfo/expressions.ll

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