Add regression tests for invalid non-blocking writes to SV constructs

Current regression tests only cover checking for invalid non-blocking
writes to constructs that are valid in Verilog. Add two tests to
additionally cover some SystemVerilog constructs.

 * Non-blocking writes to members of a struct typed variable with automatic
   lifetime
 * Non-blocking writes to class typed variables with automatic lifetime

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

ivtest/ivltests/automatic_error14.v

@@ -0,0 +1,18 @@
+// Check that it is not possible to perform non-blocking assignments to fields
+// of structs with automatic lifetime.
+
+module test;
+
+  task automatic auto_task;
+    struct packed {
+      logic x;
+    } s;
+    s.x <= 10;
+    $display("FAILED");
+  endtask
+
+  initial begin
+    auto_task;
+  end
+
+endmodule

ivtest/ivltests/automatic_error15.v

@@ -0,0 +1,19 @@
+// Check that it is not possible to perform non-blocking assignments to a class
+// object variable with automatic lifetime.
+
+module test;
+
+  class C;
+  endclass
+
+  task automatic auto_task;
+    C c1, c2;
+    c1 <= c2;
+    $display("FAILED");
+  endtask
+
+  initial begin
+    auto_task;
+  end
+
+endmodule

ivtest/regress-sv.list

@@ -104,6 +104,8 @@ assign_op_oob		normal,-g2009		ivltests
 assign_op_real_array	normal,-g2009		ivltests
 assign_op_real_array_oob normal,-g2009		ivltests
 assign_op_type		normal,-g2009		ivltests
+automatic_error14	CE,-g2005-sv		ivltests
+automatic_error15	CE,-g2005-sv		ivltests
 bitp1			normal,-g2005-sv	ivltests
 bits			normal,-g2005-sv	ivltests
 bits2			normal,-g2005-sv	ivltests