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

llvm-svn: 78213
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index c976c11..a92f7f4 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -177,8 +177,8 @@
         if (!Constructor)
           return true;
         
-        Init = CXXConstructExpr::Create(Context, DeclType, Constructor, false, 
-                                        &Init, 1);
+        Init = BuildCXXConstructExpr(Context,
+                                     DeclType, Constructor, false, &Init, 1);
         return false;
       }