Fix uninitialized variable warning in CodeGenPGO constructor. NFCI.

llvm-svn: 373526
diff --git a/clang/lib/CodeGen/CodeGenPGO.h b/clang/lib/CodeGen/CodeGenPGO.h
index 2e740f7..a3778b5 100644
--- a/clang/lib/CodeGen/CodeGenPGO.h
+++ b/clang/lib/CodeGen/CodeGenPGO.h
@@ -41,8 +41,8 @@
 
 public:
   CodeGenPGO(CodeGenModule &CGM)
-      : CGM(CGM), NumValueSites({{0}}), NumRegionCounters(0), FunctionHash(0),
-        CurrentRegionCount(0) {}
+      : CGM(CGM), FuncNameVar(nullptr), NumValueSites({{0}}),
+        NumRegionCounters(0), FunctionHash(0), CurrentRegionCount(0) {}
 
   /// Whether or not we have PGO region data for the current function. This is
   /// false both when we have no data at all and when our data has been