David Blaikie a53e28e290 llvm-symbolizer: Avoid infinite recursion walking dwos where the dwo contains a dwo_name attribute ...

The dwo_name was added to dwo files to improve diagnostics in dwp, but
it confuses tools that attempt to load any dwo named by a dwo_name, even
ones inside dwos. Avoid this by keeping track of whether a unit is
already a dwo unit, and if so, not loading further dwos.

llvm-svn: 267241

2016-04-22 22:50:56 +00:00

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