* hash.c (rb_hash_tbl_raw), internal.h: added.
  Returns st_table without shading hash.
* array.c: use rb_hash_tbl_raw() for read-only purpose.
* compile.c (iseq_compile_each): ditto.
* gc.c (count_objects): ditto.
* insns.def: ditto.
* process.c: ditto.
* thread.c (clear_coverage): ditto.
* vm_insnhelper.c: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40937 b2dd03c8-39d4-4d8f-98ff-823fe69b080e