[parrot/parrot] 212760: [pmc] this should be the last splice fix GH #1176

[GitHub]

  Branch: refs/heads/smoke-me/rpa-splice-shrink-fast-gh1174
  Home:   https://github.com/parrot/parrot
  Commit: 212760667d06d818b947d8a39114b80e0975622b
      https://github.com/parrot/parrot/commit/212760667d06d818b947d8a39114b80e0975622b
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2015-01-18 (Sun, 18 Jan 2015)

  Changed paths:
    M src/pmc/resizablepmcarray.pmc
    M t/pmc/resizablepmcarray.t

  Log Message:
  -----------
  [pmc] this should be the last splice fix GH #1176

Do not enlarge the array on overlarge offset. Rather fix the offset, as in perl5.
Add a proper testcase also