* array.c (ary_add_hash): set and return values because string keys
  will be frozen. [ruby-core:58809] [Bug #9202]

* array.c (rb_ary_uniq_bang): ditto.

* array.c (rb_ary_or): ditto.

* array.c (rb_ary_uniq): ditto.

* test/ruby/test_array.rb: tests for above.

The patch is from normalperson (Eric Wong).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43969 b2dd03c8-39d4-4d8f-98ff-823fe69b080e