[binutils-gdb] [Cell/B.E.] Make parse_spufs_run more robust

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 791bb1f4a6310cd7f894e370607dfc05c9cb0727 ***

Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Branch: master
Commit: 791bb1f4a6310cd7f894e370607dfc05c9cb0727

[Cell/B.E.] Make parse_spufs_run more robust

With recent changes to inferior handling, parse_spufs_run needs to be
more careful in assumptions it makes.  In particular, this patch:

- Bails out early if the current inferior has not yet been registered
  (e.g. during fork procession) to avoid assertion failures in register
  cache code.

- Sets inferior_ptid to the current ptid while calling target_read_memory
  to make sure the correct process is accessed if parse_spufs_run is
  called early when inferior_ptid has not yet been switched by the caller.

ChangeLog:

	* spu-multiarch.c (parse_spufs_run): Bail out if inferior is not
	registered yet.  Set inferior_ptid while calling target_read_memory.