Add YAML parser to Support.

llvm-svn: 153977
diff --git a/llvm/test/YAMLParser/construct-str.data b/llvm/test/YAMLParser/construct-str.data
new file mode 100644
index 0000000..dc1ce82
--- /dev/null
+++ b/llvm/test/YAMLParser/construct-str.data
@@ -0,0 +1,3 @@
+# RUN: yaml-bench -canonical %s
+
+string: abcd