Suggesting to move this item into the new section I suggested below.
Maybe rewrite the whole section (starting from "Changes to builtin-function inclusion with TableGen") as follows:
OpenCL builtin functions: - The majority of the OpenCL builtin functions are now available through the experimental `-fdeclare-opencl-builtins` option. - Align the `enqueue_marker` declaration in `opencl-c.h` to the OpenCL spec. - Avoid a void pointer cast in the `CLK_NULL_EVENT` definition.