AMD Drops TGSI Support From Their RadeonSI OpenGL Driver

It was just shy of a month ago in Mesa 20.0-devel code that RadeonSI enabled NIR by default to enjoy OpenGL 4.6 support and now already ahead of the Mesa 20.0 branching the previous TGSI code-path has been removed. TGSI has been the default intermediate representation of RadeonSI and other Gallium3D drivers but these days NIR has become the go-to IR for Mesa drivers...