Remove UUID::SetFromCString

Replace uses with SetFromStringRef. NFC.

llvm-svn: 335246
diff --git a/lldb/source/Interpreter/Property.cpp b/lldb/source/Interpreter/Property.cpp
index bef28f1..369029b 100644
--- a/lldb/source/Interpreter/Property.cpp
+++ b/lldb/source/Interpreter/Property.cpp
@@ -194,7 +194,7 @@
     {
       UUID uuid;
       if (definition.default_cstr_value)
-        uuid.SetFromCString(definition.default_cstr_value);
+        uuid.SetFromStringRef(definition.default_cstr_value);
       m_value_sp.reset(new OptionValueUUID(uuid));
     }
     break;