[parrot/parrot] 6a4811: [extend] special case ext_call "->"

[GitHub]

  Branch: refs/heads/smoke-me/embed-gh829
  Home:   https://github.com/parrot/parrot
  Commit: 6a48117eca2136b8d8d4cf0c78326520ee3596a3
      https://github.com/parrot/parrot/commit/6a48117eca2136b8d8d4cf0c78326520ee3596a3
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2014-11-25 (Tue, 25 Nov 2014)

  Changed paths:
    M src/extend.c

  Log Message:
  -----------
  [extend] special case ext_call "->"

might be a worthwile optimization. however:
16.589294527 0.13% => 16.612686915 0.21% on parrot-bench linux
similar on darwin, but darwin bench is more noisy