Add regression test for disabling binary NAND and NOR operators.

ivtest/gold/br_gh552-iverilog-stderr.gold

@@ -0,0 +1,2 @@
+ivltests/br_gh552.v:8: error: The binary NAND operator is an Icarus Verilog extension. Use -gicarus-misc to enable it.
+ivltests/br_gh552.v:9: error: The binary NOR operator is an Icarus Verilog extension. Use -gicarus-misc to enable it.

ivtest/ivltests/br_gh552.v

@@ -0,0 +1,12 @@
+module test;
+
+reg [7:0] a;
+reg [7:0] b;
+reg [7:0] c;
+
+initial begin
+  c = a ~& b;
+  c = a ~| b;
+end
+
+endmodule

ivtest/regress-vvp.list

@@ -25,6 +25,7 @@ br_gh383b			vvp_tests/br_gh383b.json
 br_gh383c			vvp_tests/br_gh383c.json
 br_gh383d			vvp_tests/br_gh383d.json
 br_gh440			vvp_tests/br_gh440.json
+br_gh552			vvp_tests/br_gh552.json
 br_gh687			vvp_tests/br_gh687.json
 br_gh710a			vvp_tests/br_gh710a.json
 br_gh710b			vvp_tests/br_gh710b.json

ivtest/vvp_tests/br_gh552.json

@@ -0,0 +1,6 @@
+{
+    "type"   : "CE",
+    "source" : "br_gh552.v",
+    "gold"   : "br_gh552",
+    "iverilog-args" : [ "-gno-icarus-misc" ]
+}