Add regression tests for implicit function/task import the unit scope

Check that implicit import of functions and tasks is supported if the
wildcard import statement is in the unit scope.

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

ivtest/ivltests/sv_wildcard_import8.v

@@ -0,0 +1,28 @@
+// Check that implicit imports of functions and tasks works if the wildcard
+// import statement is in the unit scope.
+
+package P;
+
+  function integer f(integer x);
+    return x * 2;
+  endfunction
+
+  task t(bit failed);
+    if (failed) begin
+      $display("FAILED");
+    end else begin
+      $display("PASSED");
+    end
+  endtask
+
+endpackage
+
+import P::*;
+
+module test;
+
+  initial begin
+    t(f(10) !== 20);
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -41,6 +41,7 @@ sv_array_cassign6		vvp_tests/sv_array_cassign6.json
 sv_array_cassign7		vvp_tests/sv_array_cassign7.json
 sv_foreach9			vvp_tests/sv_foreach9.json
 sv_foreach10			vvp_tests/sv_foreach10.json
+sv_wildcard_import8		vvp_tests/sv_wildcard_import8.json
 sdf_header			vvp_tests/sdf_header.json
 task_return1			vvp_tests/task_return1.json
 task_return2			vvp_tests/task_return2.json

ivtest/vvp_tests/sv_wildcard_import8.json

@@ -0,0 +1,5 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_wildcard_import8.v",
+    "iverilog-args" : [ "-g2005-sv" ]
+}