llvm

9c1cb8ac - [SYCL] Replace direct builtins-side multi_ptr usage with forward-declaration (#21687)

[SYCL] Replace direct builtins-side multi_ptr usage with forward-declaration (#21687) `sycl/builtins.hpp>` no longer needs to include the full <sycl/multi_ptr.hpp> definition. Preserve `multi_ptr` builtin behavior once multi_ptr.hpp is included, and update include-deps / regression coverage. On a TU including only <sycl/builtins.hpp> we observe 3.5% reduction for host compilation and 21.7% reduction for device compilation.