[ruby-cvs:79058] 170f4dbb9b (master): Fix unused warnings

Kazuhiro NISHIYAMA	2020-01-03 14:53:25 +0900 (Fri, 03 Jan 2020)

  New Revision: 170f4dbb9b

  https://github.com/ruby/ruby/commit/170f4dbb9b

  Log:
    Fix unused warnings
    =

    http://ci.rvm.jp/results/trunk_gcc7@silicon-docker/2539622
    ```
    /tmp/ruby/v2/src/trunk_gcc7/class.c: In function 'rb_scan_args_parse'=
:
    /tmp/ruby/v2/src/trunk_gcc7/class.c:1971:12: warning: unused variable=
 'tmp_buffer' [-Wunused-variable]
         VALUE *tmp_buffer =3D arg->tmp_buffer;
                ^~~~~~~~~~
    ```
    ```
    In file included from /tmp/ruby/v2/src/trunk_gcc7/vm_insnhelper.c:189=
5:0,
                     from /tmp/ruby/v2/src/trunk_gcc7/vm.c:349:
    /tmp/ruby/v2/src/trunk_gcc7/vm_args.c:212:1: warning: 'args_stored_kw=
_argv_to_hash' defined but not used [-Wunused-function]
     args_stored_kw_argv_to_hash(struct args_info *args)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
    ```

  Modified files:
    class.c
    vm_args.c=