[polly] r237616 - Update isl to 6be6768e

[Tobias Grosser]

On 05/18/2015 11:29 PM, Tobias Grosser wrote:
> Author: grosser
> Date: Mon May 18 16:29:58 2015
> New Revision: 237616
>
> URL: http://llvm.org/viewvc/llvm-project?rev=237616&view=rev
> Log:
> Update isl to 6be6768e
>
> Besides a couple of interface cleanups, this change also contains a performance
> optimization of isl_mat_product that should give us up to almost 6% compiletime
> reduction.

http://llvm.org/perf/db_default/v4/nts/27013?num_comparison_runs=0&test_filter=&test_min_value_filter=&aggregation_fn=median&MW_confidence_lv=0.01&compare_to=27006&submit=Update

Our LNT test results confirm this. 10 benchmarks show between 4-6% 
compile time reduction.

Best,
Tobias