[ARM] Fix PR middle-end/65958

[Yao Qi]

Hi Eric,

On 06/10/15 11:11, Eric Botcazou wrote:
> Here's the implementation for aarch64, very similar but simpler since there is
> no shortage of scratch registers; the only thing to note is the new blockage
> pattern.  This was tested on real hardware but not with Linux, instead with
> Darwin (experimental port of the toolchain to iOS) and makes it possible to
> pass ACATS (Ada conformance testsuite which requires stack checking).
>
> There is also a couple of tweaks for the ARM implementation: a cosmetic one
> for the probe_stack pattern and one for the output_probe_stack_range loop.

I assume that this patch (and arm patch) will change the instruction
sequences in prologue.  If so, do you have some examples about how
prologue is changed with this patch?  I need to adapt GDB prologue
analyser to these new instruction sequences.

-- 
Yao (齐尧)