instruction sequence for jumps:

  mov(ip, Operand(target, rmode), LeaveCC, cond);
  bx(ip, cond)

Changed a JS call in the compare stub to a tail call to avoid GC
problems where the pushed return address is not updated on GC.
Review URL: http://codereview.chromium.org/549022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3582 ce2b1a6d-e550-0410-aec6-3dcde31c8c00