Get rid of Stmt::Clone now that we can reference count statements instead.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78452 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplateInstantiateStmt.cpp b/lib/Sema/SemaTemplateInstantiateStmt.cpp
index 565b95b..80ff5eb 100644
--- a/lib/Sema/SemaTemplateInstantiateStmt.cpp
+++ b/lib/Sema/SemaTemplateInstantiateStmt.cpp
@@ -81,7 +81,7 @@
 }
 
 Sema::OwningStmtResult TemplateStmtInstantiator::VisitNullStmt(NullStmt *S) {
-  return SemaRef.Owned(S->Clone(SemaRef.Context));
+  return SemaRef.Owned(S->Retain());
 }
 
 Sema::OwningStmtResult TemplateStmtInstantiator::VisitLabelStmt(LabelStmt *S) {
@@ -112,12 +112,12 @@
 }
 
 Sema::OwningStmtResult TemplateStmtInstantiator::VisitBreakStmt(BreakStmt *S) {
-  return SemaRef.Owned(S->Clone(SemaRef.Context));
+  return SemaRef.Owned(S->Retain());
 }
 
 Sema::OwningStmtResult 
 TemplateStmtInstantiator::VisitContinueStmt(ContinueStmt *S) {
-  return SemaRef.Owned(S->Clone(SemaRef.Context));
+  return SemaRef.Owned(S->Retain());
 }
 
 Sema::OwningStmtResult