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Commit 5043f916 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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DebugInfo: Don't call DIBuilder::retainType(nullptr) 

An upcoming LLVM commit will make calling
`DIBuilder::retainType(nullptr)` illegal (actually, it already was, but
it wasn't verified).  Check for null before calling.

This triggered in test/CodeGenObjC/debug-info-block-helper.m.

llvm-svn: 233443
parent d5c60d03
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