Add regression tests for suppressed VCD/LXT/LXT2 warnings (issue #710)

ivtest/gold/br_gh710a-vvp-stdout.gold

@@ -0,0 +1,2 @@
+VCD info: dumpfile dump.vcd opened for output.
+VCD warning: $dumpvars: Package (p2::) is not dumpable with VCD.

ivtest/gold/br_gh710b-vvp-stdout.gold

@@ -0,0 +1,2 @@
+LXT info: dumpfile dump.lxt opened for output.
+LXT warning: $dumpvars: Package (p2::) is not dumpable with LXT.

ivtest/gold/br_gh710c-vvp-stdout.gold

@@ -0,0 +1,2 @@
+LXT2 info: dumpfile dump.lx2 opened for output.
+LXT2 warning: $dumpvars: Package (p2::) is not dumpable with LXT2.

ivtest/ivltests/br_gh710.v

@@ -0,0 +1,15 @@
+package p1;
+
+endpackage
+
+package p2;
+
+logic x;
+
+endpackage
+
+module m;
+
+initial $dumpvars;
+
+endmodule

ivtest/regress-vvp.list

@@ -24,6 +24,9 @@ br_gh383c			vvp_tests/br_gh383c.json
 br_gh383d			vvp_tests/br_gh383d.json
 br_gh440			vvp_tests/br_gh440.json
 br_gh687			vvp_tests/br_gh687.json
+br_gh710a			vvp_tests/br_gh710a.json
+br_gh710b			vvp_tests/br_gh710b.json
+br_gh710c			vvp_tests/br_gh710c.json
 br_gh939			vvp_tests/br_gh939.json
 br_gh1018			vvp_tests/br_gh1018.json
 br_gh1029			vvp_tests/br_gh1029.json

ivtest/vvp_tests/br_gh710a.json

@@ -0,0 +1,7 @@
+{
+    "type"   : "normal",
+    "source" : "br_gh710.v",
+    "gold"   : "br_gh710a",
+    "iverilog-args" : [ "-g2009" ],
+    "vvp-args-extended" : [ "-vcd" ]
+}

ivtest/vvp_tests/br_gh710b.json

@@ -0,0 +1,7 @@
+{
+    "type"   : "normal",
+    "source" : "br_gh710.v",
+    "gold"   : "br_gh710b",
+    "iverilog-args" : [ "-g2009" ],
+    "vvp-args-extended" : [ "-lxt" ]
+}

ivtest/vvp_tests/br_gh710c.json

@@ -0,0 +1,7 @@
+{
+    "type"   : "normal",
+    "source" : "br_gh710.v",
+    "gold"   : "br_gh710c",
+    "iverilog-args" : [ "-g2009" ],
+    "vvp-args-extended" : [ "-lxt2" ]
+}