vm_insnhelper.c: inline function

* vm_insnhelper.c (vm_callee_setup_arg): turn a macro into an
  inline function.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45320 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_insnhelper.c: disable fastpath if splat

* vm_insnhelper.c (vm_callee_setup_arg): disable fastpath if splat
  argument, since argc may differ for each calls.
  [ruby-core:61422] [Bug #9622]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45321 b2dd03c8-39d4-4d8f-98ff-823fe69b080e