[PATCH v4 0/14] Run all-stop on non-stop target

[Yao Qi <yao at codesourcery dot com>]

This series are the V4 of this sereis, and V3 can be found here,

  [PATCH v3 0/15] Run all-stop on non-stop target
  http://sourceware.org/ml/gdb-patches/2012-04/msg00278.html

This version includes following changes, compared with V3,

  - Rebased to CVS trunk
  - Remove [PATCH 09/15] Don't trigger async event in inf-call and 
[PATCH 11/15] Don't check $ after gdb_prompt out of this sereis,
because they are not relevant.
  - Add changes to ia64-sigill.exp.

Tested on x86_64 native and native-gdbserver.  No regressions.

All ITSET patches in my local trees are dependent on this series
of patches.  They are about changes in many files, so that other
commits to CVS trunk may easily break them.  I appreciate people
can review them shortly, to reduce my pain to resolve conflicts
in five different git branches.