Added missing methods to get Designators source range.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127735 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index 9c44442..59de3fe 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -2740,6 +2740,14 @@
     Designators[I] = Desigs[I];
 }
 
+SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
+  DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
+  if (size() == 1)
+    return DIE->getDesignator(0)->getSourceRange();
+  return SourceRange(DIE->getDesignator(0)->getStartLocation(),
+                     DIE->getDesignator(size()-1)->getEndLocation());
+}
+
 SourceRange DesignatedInitExpr::getSourceRange() const {
   SourceLocation StartLoc;
   Designator &First =