Add YAML parser to Support.

llvm-svn: 153977
diff --git a/llvm/test/YAMLParser/duplicate-value-key.former-loader-error.data b/llvm/test/YAMLParser/duplicate-value-key.former-loader-error.data
new file mode 100644
index 0000000..dc20e0b
--- /dev/null
+++ b/llvm/test/YAMLParser/duplicate-value-key.former-loader-error.data
@@ -0,0 +1,6 @@
+# RUN: yaml-bench -canonical %s
+
+---
+=: 1
+foo: bar
+=: 2