Add br_gh699 regression test.

ivtest/ivltests/br_gh699.v

@@ -0,0 +1,9 @@
+
+// This should generate an error reporting the undef_func, but not segfault.
+module test1;
+   function [31:0] func1 (input [31:0] x);
+      return undef_func(x);
+   endfunction : func1
+
+   localparam X = func1(1);
+endmodule : test1

ivtest/regress-sv.list

@@ -210,6 +210,7 @@ br_gh568		normal,-g2009		ivltests
 br_gh661a		normal,-g2009		ivltests
 br_gh661b		normal,-g2009		ivltests
 br_gh672		normal,-g2009		ivltests
+br_gh699		CE,-g2009		ivltests
 br_ml20171017		normal,-g2009		ivltests
 br_ml20180227		CE,-g2009		ivltests
 br_ml20180309a		normal,-g2009		ivltests