convert unpacked parameter dimensions (closes #18)

test/basic/unpacked_localparam.sv

@@ -0,0 +1,12 @@
+module top;
+    localparam logic [7:0] init_val [4] = {8'd0, 8'd8, 8'd10, 8'd200};
+    initial begin
+        integer i, j;
+        for (i = 0; i < 4; i += 1) begin
+            $display(init_val[i]);
+            for (j = 0; j < 8; j += 1) begin
+                $display(init_val[i][j]);
+            end
+        end
+    end
+endmodule

test/basic/unpacked_localparam.v

@@ -0,0 +1,12 @@
+module top;
+    localparam [31:0] init_val = {8'd0, 8'd8, 8'd10, 8'd200};
+    initial begin : foo
+        integer i, j;
+        for (i = 0; i < 4; i += 1) begin
+            $display(init_val[8*i+:8]);
+            for (j = 0; j < 8; j += 1) begin
+                $display(init_val[8*i+j]);
+            end
+        end
+    end
+endmodule