Roll libxslt to 96c9c644f30ed762735802a27784cc522cff1643

third_party/libxslt/libxslt/variables.h

Index: third_party/libxslt/libxslt/variables.h
diff --git a/third_party/libxslt/libxslt/variables.h b/third_party/libxslt/libxslt/variables.h
index f80eeab6ebb3850d9fead5f6855df951f68a6c43..24acf8d10e57ff24e5fdfbf7ee84073e1bce5ff4 100644
--- a/third_party/libxslt/libxslt/variables.h
+++ b/third_party/libxslt/libxslt/variables.h
@@ -38,9 +38,35 @@ extern "C" {
  * Flags for memory management of RVTs
  */
 
+/**
+ * XSLT_RVT_LOCAL:
+ *
+ * RVT is destroyed after the current instructions ends.
+ */
 #define XSLT_RVT_LOCAL       ((void *)1)
+
+/**
+ * XSLT_RVT_VARIABLE:
+ *
+ * RVT is part of a local variable and destroyed after the variable goes out
+ * of scope.
+ */
 #define XSLT_RVT_VARIABLE    ((void *)2)
+
+/**
+ * XSLT_RVT_FUNC_RESULT:
+ *
+ * RVT is part of results returned with func:result. The RVT won't be
+ * destroyed after exiting a template and will be reset to XSLT_RVT_LOCAL or
+ * XSLT_RVT_VARIABLE in the template that receives the return value.
+ */
 #define XSLT_RVT_FUNC_RESULT ((void *)3)
+
+/**
+ * XSLT_RVT_GLOBAL:
+ *
+ * RVT is part of a global variable.
+ */
 #define XSLT_RVT_GLOBAL      ((void *)4)
 
 /*