added some more test files to vsl

exercises/05/vslc/vsl_programs/ps5-codegen1/globals.vsl

@@ -0,0 +1,12 @@
+var global_var0, global_var1
+
+func my_func(param0, param1) begin
+    var a
+    return 0
+end
+
+func main() begin
+    var a
+    print "a string"
+    return 0
+end

exercises/05/vslc/vsl_programs/ps5-codegen1/shadow.vsl

@@ -1,4 +1,7 @@
 // Checking symbol shadowing
+
+var a
+
 func shadow() begin
     var a, b
     a := 1