* include/ruby/intern.h (rb_exec_arg): remove argc and argv fields.

  add use_shell, argv_str and argv_buf fields.

* process.c (rb_proc_exec_e): don't split shell command line arguments
  here to avoid memory allocation in a child process.
  (rb_exec_fillarg): split shell command line arguments here.
  (proc_exec_v): takes argv_str argument instead of argv.
  (rb_proc_exec_ne): removed.
  (rb_proc_exec_n): removed.
  (rb_run_exec_options_err): don't initialize the removed fields.
  (rb_exec_err): don't initialize the removed fields.
  call proc_exec_v directly instead of rb_proc_exec_ne.
  (rb_spawn_process): use use_shell field.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35889 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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