Duncan P. N. Exon Smith d3a057733f DwarfDebug: Check for null DebugLocs ...

`DL` might be null, so check for that before using accessors.  A WIP
patch to make `DIDescriptors` more strict fails otherwise.

As a bonus, I think the logic is easier to follow now (despite the extra
nesting depth).

llvm-svn: 232836

2015-03-20 19:37:03 +00:00

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