Synthesize the default constructor which has not
been declared as needed.

llvm-svn: 77641
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index bb53dcc..708100e 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -238,7 +238,17 @@
       EmitDtorEpilogue(DD);
     FinishFunction(S->getRBracLoc());
   }
-
+  else 
+    if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) {
+      assert(
+             !cast<CXXRecordDecl>(CD->getDeclContext())->
+              hasUserDeclaredConstructor() &&
+             "bogus constructor is being synthesize");
+      StartFunction(FD, FD->getResultType(), Fn, Args, SourceLocation());
+      EmitCtorPrologue(CD);
+      FinishFunction();
+    }
+    
   // Destroy the 'this' declaration.
   if (CXXThisDecl)
     CXXThisDecl->Destroy(getContext());