update to follow mainline llvm API change.

llvm-svn: 49607
diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index b5c755a..f91c392 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -29,7 +29,7 @@
 namespace  {
 class VISIBILITY_HIDDEN AggExprEmitter : public StmtVisitor<AggExprEmitter> {
   CodeGenFunction &CGF;
-  llvm::LLVMFoldingBuilder &Builder;
+  llvm::IRBuilder &Builder;
   llvm::Value *DestPtr;
   bool VolatileDest;
 public: