compile.c: calc in int

* compile.c (iseq_compile_each): calculate argc as int, not as Fixnum.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compile.c: nd_line(node)

* compile.c (iseq_compile_each): keep nd_line(node) in a local
  variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39626 b2dd03c8-39d4-4d8f-98ff-823fe69b080e