[parrot/parrot] 0fc4a8: support callcontext reuse, patch courtesy of mls++

[noreply at github.com]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot

  Commit: 0fc4a808272e54a10b298694a430d849990d28e6
      https://github.com/parrot/parrot/commit/0fc4a808272e54a10b298694a430d849990d28e6
  Author: Jimmy Zhuo <zhuomingliang at yahoo.com.cn>
  Date:   2011-09-04 (Sun, 04 Sep 2011)

  Changed paths:
    M src/pmc/sub.pmc

  Log Message:
  -----------
  support callcontext reuse, patch courtesy of mls++