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Commit d3497db5 authored by Argyrios Kyrtzidis's avatar Argyrios Kyrtzidis
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In ASTWriter::WriteDeclContextVisibleBlock, don't write empty lookups. 

Empty lookups can occur in the DeclContext map when we are chaining PCHs, where
the empty lookup indicates that we already looked in ExternalASTSource.

llvm-svn: 138816
parent 342e08fb
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