Index: include/llvm/DebugInfo/PDB/IPDBSession.h
===================================================================
--- include/llvm/DebugInfo/PDB/IPDBSession.h
+++ include/llvm/DebugInfo/PDB/IPDBSession.h
@@ -40,7 +40,7 @@
     T *ConcreteSymbol = dyn_cast<T>(Symbol.get());
     if (!ConcreteSymbol)
       return nullptr;
-    Symbol.release();
+    (void)Symbol.release();
     return std::unique_ptr<T>(ConcreteSymbol);
   }
 
Index: lib/Bitcode/Reader/BitReader.cpp
===================================================================
--- lib/Bitcode/Reader/BitReader.cpp
+++ lib/Bitcode/Reader/BitReader.cpp
@@ -102,7 +102,9 @@
 
   ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
       getLazyBitcodeModule(std::move(Owner), Ctx);
-  Owner.release();
+  // Release the buffer if we didn't take ownership of it since we never owned
+  // it anyway.
+  (void)Owner.release();
   Ctx.setDiagnosticHandler(OldDiagnosticHandler, OldDiagnosticContext, true);
 
   if (ModuleOrErr.getError()) {