[analyzer] Add stop-gap patch to prevent assertion failure when analyzing LLVM codebase.

This potentially reduces a performance optimization of throwing away
PreStmtPurgeDeadSymbols nodes.  I'll investigate the performance impact
soon and see if we need something better.

llvm-svn: 176149

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/ExplodedGraph.cpp b/clang/lib/StaticAnalyzer/Core/ExplodedGraph.cpp
index a44c28341bf..2210b4e2d76 100644
--- a/clang/lib/StaticAnalyzer/Core/ExplodedGraph.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ExplodedGraph.cpp
@@ -110,7 +110,7 @@ bool ExplodedGraph::shouldCollect(const ExplodedNode *node) {
   // analysis history and are not consulted by any client code.
   ProgramPoint progPoint = node->getLocation();
   if (progPoint.getAs<PreStmtPurgeDeadSymbols>())
-    return true;
+    return !progPoint.getTag();
 
   // Condition 3.
   if (!progPoint.getAs<PostStmt>() || progPoint.getAs<PostStore>())