WholeProgramDevirt - fix uninitialized variable warnings. NFCI.
diff --git a/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp b/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
index a000037..b3ffe9d 100644
--- a/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
+++ b/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
@@ -616,8 +616,8 @@
 
   bool UseCommandLine = false;
 
-  ModuleSummaryIndex *ExportSummary;
-  const ModuleSummaryIndex *ImportSummary;
+  ModuleSummaryIndex *ExportSummary = nullptr;
+  const ModuleSummaryIndex *ImportSummary = nullptr;
 
   WholeProgramDevirt() : ModulePass(ID), UseCommandLine(true) {
     initializeWholeProgramDevirtPass(*PassRegistry::getPassRegistry());