revert r194655

llvm-svn: 195285
diff --git a/llvm/lib/Support/YAMLTraits.cpp b/llvm/lib/Support/YAMLTraits.cpp
index 599a369..c32cbda 100644
--- a/llvm/lib/Support/YAMLTraits.cpp
+++ b/llvm/lib/Support/YAMLTraits.cpp
@@ -65,7 +65,7 @@
 void Input::EmptyHNode::anchor() {}
 void Input::ScalarHNode::anchor() {}
 
-bool Input::outputting() const {
+bool Input::outputting() {
   return false;
 }
 
@@ -406,7 +406,7 @@
 Output::~Output() {
 }
 
-bool Output::outputting() const {
+bool Output::outputting() {
   return true;
 }