devel/intel-graphics-compiler: update to 1.0.4756

Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4361
Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4427
Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4479
Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4521
Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4594
Changes: https://github.com/intel/intel-graphics-compiler/releases/tag/igc-1.0.4756
Reported by: GitHub (watch releases), Repology