Add support for C++ default arguments, and rework Parse-Sema 
interaction for function parameters, fixing PR2046.

Patch by Doug Gregor!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49369 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index 8977907..2f03f88 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -169,7 +169,7 @@
   Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
     return Visit(E->getInitializer());
   }
-
+  
   Value *VisitImplicitCastExpr(const ImplicitCastExpr *E);
   Value *VisitCastExpr(const CastExpr *E) { 
     return EmitCastExpr(E->getSubExpr(), E->getType());
@@ -220,6 +220,9 @@
     return Visit(E->getSubExpr());
   }
   Value *VisitUnaryOffsetOf(const UnaryOperator *E);
+  Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
+    return Visit(DAE->getExpr());
+  }
     
   // Binary Operators.
   Value *EmitMul(const BinOpInfo &Ops) {