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

[Keno Fischer]

Hi echristo, aprantl, dblaikie,

I noticed an object file with `DW_OP_reg4 DW_OP_breg4 0` as a DWARF expression, which I traced to a missing break (and `++I`) in this code snippet. While I was at it, I also added support for a few other corner cases along the same lines that I could think of. Please have a look - I've read the DWARF spec, but am I by no means an expert.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10302

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

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