* features/code_check/W1047.feature : Add scenario to reproduce a known
  bug.

* lib/adlint/cc1/syntax.rb : Fix bad expression-constancy check in order
  to treat an address-expression as a constant-expression.
* lib/adlint/exam/c_builtin/cc1_check.rb : Fix W1047 code check to check
  expression constancy by the newly added unified interface.