Patch to propagate GDB's knowledge of the executing state to frontend

[ali_anwar]

Hi,

Attached patch is to let GDB propagate the target state under following 
two scenarios:

1. Attached patch will enable GDB to inform about the state of the 
target when it was not able to fetch the non-general registers, when 
target is already stopped.

The reason behind this behavior was an error message which was caused 
when the GDB was not able to fetch the value of a certain register. The 
GDB should have told the front end about the current state of the 
target. The attached patch makes sure that it happens. This patch should 
be a safety measure in case some debugging stub behaves badly.

2. Attached patch will enable GDB to inform about the state of the 
target when it was not able to fetch the backtrace once the step has 
already occurred and target is in stopped state.

I have tested the patch for powerpc-eabi as well as i686-pc-linux. No 
regression was introduced by the patch and results were identical with 
and without the patch.

The patch has also been tested with both sync and async mode, no regression.

OK?

Thanks,
-Ali

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