Add regression test for end labels on unnamed blocks

An end label on an unnamed block should generate an error. Add a regression
test to check this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/gold/sv_end_labels_unnamed.gold

@@ -0,0 +1,3 @@
+./ivltests/sv_end_labels_unnamed.v:7: error: unnamed block must not have end label.
+./ivltests/sv_end_labels_unnamed.v:11: error: unnamed block must not have end label.
+./ivltests/sv_end_labels_unnamed.v:14: error: unnamed fork must not have end label.

ivtest/ivltests/sv_end_labels_unnamed.v

@@ -0,0 +1,16 @@
+// Check that end labels on unnamed blocks generate an error
+
+module test;
+
+  generate
+    if (1) begin
+    end : label
+  endgenerate
+
+  initial begin
+  end : label
+
+  initial fork
+  join : label
+
+endmodule

ivtest/regress-sv.list

@@ -451,6 +451,7 @@ sv_end_label		normal,-g2005-sv	ivltests
 sv_end_label_fail	CE,-g2009		ivltests gold=sv_end_label_fail.gold
 sv_end_labels		normal,-g2009		ivltests
 sv_end_labels_bad	CE,-g2009		ivltests gold=sv_end_labels_bad.gold
+sv_end_labels_unnamed	CE,-g2009		ivltests gold=sv_end_labels_unnamed.gold
 sv_enum1		normal,-g2009		ivltests
 sv_for_variable		normal,-g2009		ivltests
 sv_foreach1		normal,-g2009		ivltests