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/CGExprComplex.cpp b/lib/CodeGen/CGExprComplex.cpp
index 1e8c8a3..a486d6a 100644
--- a/lib/CodeGen/CGExprComplex.cpp
+++ b/lib/CodeGen/CGExprComplex.cpp
@@ -120,6 +120,9 @@
   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
     return Visit(E->getSubExpr());
   }
+  ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
+    return Visit(DAE->getExpr());
+  }
   
   struct BinOpInfo {
     ComplexPairTy LHS;