Add regression test for br_gh674.

ivtest/ivltests/br_gh674.v

@@ -0,0 +1,27 @@
+module test();
+
+function integer array_value(input integer idx);
+
+  reg [31:0] local_array[1:-1];
+  integer i;
+
+  begin
+    for (i = -2; i <= 2; i = i + 1) local_array[i] = i;
+    array_value = local_array[idx];
+  end
+endfunction
+
+localparam avm2 = array_value(-2);
+localparam avm1 = array_value(-1);
+localparam av0  = array_value(0);
+localparam avp1 = array_value(1);
+localparam avp2 = array_value(2);
+
+initial begin
+  if (avm2 === 'bx && avm1 === -1 && av0 === 0 && avp1 === 1 && avp2 === 'bx)
+    $display("PASSED");
+  else
+    $display("FAILED");
+end
+
+endmodule

ivtest/regress-vlg.list

@@ -346,6 +346,7 @@ br_gh621		normal			ivltests
 br_gh632		normal			ivltests
 br_gh632b		normal,-S		ivltests
 br_gh632c		normal			ivltests
+br_gh674		normal			ivltests
 br_ml20150315		normal			ivltests gold=br_ml_20150315.gold
 br_ml20150321		CE			ivltests
 br_ml20150606		normal			ivltests