adjust fallback_frame_state for 32bits AIX 7.1

[Olivier Hainque]

Hello,

This is a tiny change we have been using successfully for at least a couple
of years now, improving exception propagation through signal handlers on 32bits
AIX 7.1.

While this isn't a complete generalization to all possible configurations
(haven't had the time to converge on 64bits kernels at this stage, unfortunately),
this is nevertheless an improvement on 32bits.

The patch is very short and in line with what is already there, and we thought
it might be useful to others as well.

OK to commit ?

2015-01-05  Olivier Hainque  <hainque@adacore.com>

libgcc/
	* config/rs6000/aix-unwind.h (ucontext_for): Handle AIX 7.1
	specificities. 

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