fix combined array declarations (resolves #34)

test/basic/multi_array_decl.sv

@@ -0,0 +1,19 @@
+module top;
+    typedef struct packed {
+        logic f1;
+        logic f2;
+    } T;
+
+    T a[1:0];
+    T b[1:0];
+
+    T c[1:0], d[1:0];
+    T e[1:0], f[1:0], g;
+    T h, i[1:0];
+    T j;
+
+    struct packed {
+        logic f1;
+        logic f2;
+    } k;
+endmodule