make `RARRAY_PTR_USE` more conservertive.

* include/ruby/ruby.h: de-transient at
  `RARRAY_PTR_USE` and `RARRAY_PTR_USE_START`.
  Introduce `RARRAY_PTR_USE_TRANSIENT` and
  `RARRAY_PTR_USE_START_TRANSIENT` if you don't want to
  de-transient an array. Generally, it is difficult
  so C-extension writers should not use them.

* array.c: use `RARRAY_PTR_USE_TRANSIENT` if possible.

* hash.c: ditto.

* enum.c (enum_sort_by): remove `rb_ary_transient_heap_evacuate()`
  because `RARRAY_PTR_USE` do de-transient.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66165 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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