Emit lifetime.start / lifetime.end markers for unnamed temporary objects.

This will give more information to the optimizers so that they can reuse stack slots
and reduce stack usage.

llvm-svn: 218865

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -229,6 +229,11 @@ void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
       DI->EmitLocation(Builder, EndLoc);
   }
 
+  // Some top level lifetime extended variables may still need
+  // to have their cleanups called.
+  if (!LifetimeExtendedCleanupStack.empty())
+    MoveDeferedCleanups(0);
+
   // Pop any cleanups that might have been associated with the
   // parameters.  Do this in whatever block we're currently in; it's
   // important to do this before we enter the return block or return