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"ClearDIEs()" was being called too soon, before everyone was done using the DIEs. This fix delays the calls to ::ClearDIEs() until all compile units have been indexed. 1 - Call "::ExtractDIEsIfNeeded()" on all compile units on separate threads. See if each CU has the DIEs parsed and remember this. 2 - Index all compile units on separate threads. 3 - Clear any DIEs in any compile units that didn't have their DIEs parsed after all compile units have been indexed. Patch by phlav Differential Revision: http://reviews.llvm.org/D20738 llvm-svn: 271209