[committed] jit: add gcc_jit_type_get_vector

[Michael Cree]

On Wed, Aug 16, 2017 at 10:01:57AM -0400, David Malcolm wrote:
> On Wed, 2017-08-16 at 21:58 +1200, Michael Cree wrote:
> > 
> > But I have hit a problem which I suspect is a bug in the gcc
> > optimiser.
> > 
> > In the vein of your example above, but working on uint8_t pixel data
> > and adding saturation, the jit compiler segfaults in the optimiser. I
> > provide below the gimple produced by the function that causes the
> > problem (I presume that is more useful than the code calling the
> > gcc_jit routines), 
> 
> There's actually a handy entrypoint for generating minimal reproducers
> for such crashes:
>   gcc_jit_context_dump_reproducer_to_file
> 
> https://gcc.gnu.org/onlinedocs/jit/topics/contexts.html#gcc_jit_context_dump_reproducer_to_file
> 
> Can you add a call to that to your code (after the context is fully
> populated), and see if the resulting .c file leads to the crash when
> run?  If so, can you post the .c file here please (or attach it to
> bugzilla), and hopefully I can then reproduce it at my end.

Attached.

Cheers
Michael.
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