Fix CASE_CHAIN typos

	gcc/
	* tree-cfg.c (edge_to_cases_cleanup): Fix CASE_CHAIN typo.
	* tree.def (CASE_LABEL_EXPR): Likewise.

From-SVN: r237384

gcc/ChangeLog

+2016-06-13  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* tree-cfg.c (edge_to_cases_cleanup): Fix CASE_CHAIN typo.
+	* tree.def (CASE_LABEL_EXPR): Likewise.
+
 2016-06-13  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	* input.c (test_builtins): Fix an assertion.

gcc/tree-cfg.c

@@ -1126,7 +1126,7 @@ make_cond_expr_edges (basic_block bb)
 /* Called for each element in the hash table (P) as we delete the
    edge to cases hash table.
 
-   Clear all the TREE_CHAINs to prevent problems with copying of
+   Clear all the CASE_CHAINs to prevent problems with copying of
    SWITCH_EXPRs and structure sharing rules, then free the hash table
    element.  */
 

gcc/tree.def

@@ -949,7 +949,7 @@ DEFTREECODE (SWITCH_EXPR, "switch_expr", tcc_statement, 3)
    Operand 1 is CASE_HIGH.  If it is NULL_TREE, the label is a simple
      (one-value) case label.  If it is non-NULL_TREE, the case is a range.
    Operand 2 is CASE_LABEL, which is is the corresponding LABEL_DECL.
-   Operand 4 is CASE_CHAIN.  This operand is only used in tree-cfg.c to
+   Operand 3 is CASE_CHAIN.  This operand is only used in tree-cfg.c to
      speed up the lookup of case labels which use a particular edge in
      the control flow graph.  */
 DEFTREECODE (CASE_LABEL_EXPR, "case_label_expr", tcc_statement, 4)