Keno Fischer bacc64b5fa [StripDeadDebugInfo] Drop dead CUs entirely ...

Summary:
Prior to this while it would delete the dead DIGlobalVariables, it would
leave dead DICompileUnits and everything referenced therefrom. For a bit
bitcode file with thousands of compile units those dead nodes easily
outnumbered the real ones. Clean that up.

Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D31720

llvm-svn: 299692

2017-04-06 19:26:22 +00:00

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