envutil.rb: no core dump

* test/ruby/envutil.rb (assert_separately): imply no core dump.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38961 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_backtrace.c: use long

* vm_backtrace.c (rb_debug_inspector_frame_{class,binding,iseq}_get):
  use long as index as well as RARRAY_LEN().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38962 b2dd03c8-39d4-4d8f-98ff-823fe69b080e