This PR:
* adds __spirv_ builtins for existing instructions;
* fixes parsing of "syncscope" values in atomic instructions;
* fix a special case of binary header emision.
The patch adds support for OpenCL and SPIR-V built-in functions.
Their detection and properties are implemented using TableGen.
Five tests are added to demonstrate the improvement.
Differential Revision: https://reviews.llvm.org/D132024
Co-authored-by: Aleksandr Bezzubikov <zuban32s@gmail.com>
Co-authored-by: Michal Paszkowski <michal.paszkowski@outlook.com>
Co-authored-by: Andrey Tretyakov <andrey1.tretyakov@intel.com>
Co-authored-by: Konrad Trifunovic <konrad.trifunovic@intel.com>
