preserve global resolved type properly

examples/programs/arraylist/main.bro

@@ -10,6 +10,8 @@ State :: struct {
 	diagnostics std.ArrayList(ScanDiagnostic)
 }
 
+arrlist_test std.ArrayList(Token) = arraylist.init(mem.c_allocator)
+
 hide fail_alloc func(_ ?@mut anyopaque, _ usize, _ usize) ?*mut u8 {
 	return none
 }