Add regression tests for package scope identifiers that cross the package boundary

Check that an error is reported when accessing a hierarchical identifier
through a package scoped identifier.

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

ivtest/ivltests/sv_ps_hier_fail1.v

@@ -0,0 +1,16 @@
+// Check that package scoped identifiers lookup does not cross the package
+// boundary.
+
+int x;
+
+package P;
+endpackage
+
+module test;
+  initial begin
+    int y;
+    y = P::x; // This should fail. x is visible from within the package,
+              // but can't be accessed through a package scoped identifier.
+    $display("FAILED");
+  end
+endmodule

ivtest/ivltests/sv_ps_hier_fail2.v

@@ -0,0 +1,16 @@
+// Check that package scoped identifiers lookup does not cross the package
+// boundary.
+
+package P;
+endpackage
+
+module test;
+  int x;
+  initial begin
+    int y;
+    y = P::test.x; // This should fail. test.x is visible from within the
+                   // package, but it can not be accessed through a package
+                   // scoped identifier.
+    $display("FAILED");
+  end
+endmodule

ivtest/regress-sv.list

@@ -704,6 +704,8 @@ sv_ps_function7		normal,-g2009		ivltests
 sv_ps_function_fail1	CE,-g2009		ivltests
 sv_ps_function_fail2	CE,-g2009		ivltests
 sv_ps_function_fail3	CE,-g2009		ivltests
+sv_ps_hier_fail1	CE,-g2009		ivltests
+sv_ps_hier_fail2	CE,-g2009		ivltests
 sv_ps_member_sel1	normal,-g2009		ivltests
 sv_ps_member_sel2	normal,-g2009		ivltests
 sv_ps_member_sel3	normal,-g2009		ivltests