Add EmitReferenceBindingToExpr. Have EmitCallArg use it for now. Doesn't support anything but at least we don't crash ;)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72147 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 10fc6d9..d444bae 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -2001,6 +2001,9 @@
 }
 
 RValue CodeGenFunction::EmitCallArg(const Expr *E, QualType ArgType) {
+  if (ArgType->isReferenceType())
+    return EmitReferenceBindingToExpr(E, ArgType);
+  
   return EmitAnyExprToTemp(E);
 }