Patch to improve ir-gen for constructors with default argument
expressions and a test case.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78213 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 2ebd7b1..7e0422e 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -911,8 +911,8 @@
     assert(!ToType->isReferenceType());
     
     // FIXME: Keep track of whether the copy constructor is elidable or not.
-    From = CXXConstructExpr::Create(Context, ToType, 
-                                    SCS.CopyConstructor, false, &From, 1);
+    From = BuildCXXConstructExpr(Context,
+                                 ToType, SCS.CopyConstructor, false, &From, 1);
     return false;
   }