[yaml2obj] Fix build. Apparently I've gotten too familiar with C++11.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161206 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/yaml2obj/yaml2obj.cpp b/utils/yaml2obj/yaml2obj.cpp
index d21336f..eecf574 100644
--- a/utils/yaml2obj/yaml2obj.cpp
+++ b/utils/yaml2obj/yaml2obj.cpp
@@ -39,7 +39,7 @@
   Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
 
 template<class T>
-typename std::enable_if<std::numeric_limits<T>::is_integer, bool>::type
+typename llvm::enable_if_c<std::numeric_limits<T>::is_integer, bool>::type
 getAs(const llvm::yaml::ScalarNode *SN, T &Result) {
   SmallString<4> Storage;
   StringRef Value = SN->getValue(Storage);