Second Mesa 12.0.0 3D Graphics Library Release Candidate Adds 59 Improvements

Mesa 3D Graphics Library 12.0.0 RC2 is here to add a total of 60 bug fixes and improvements for various display drivers, including Intel i965, which received new nir channel_num system value, a nir-based thread ID uniform and intrinsic lowering, as well as support for cross-thread constants and a new local ID push constant.