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Yury Plyakhin b862554a70 [Offload][libsycl][clang-sycl-linker] Simplify SYCL Offload wrapping (#193876 )

Replace the __sycl_tgt_bin_desc/__sycl_tgt_device_image-based fat binary
registration with a simpler OffloadBinary-native approach:

- __sycl_register_lib/__sycl_unregister_lib now take (BinaryStart, Size)
instead of a __sycl_tgt_bin_desc pointer; __sycl_unregister_lib only
needs BinaryStart since the runtime looks up the binary by its start
address.
- OffloadWrapper's SYCL wrapping is significantly simplified: the
__tgt_bin_desc/__tgt_device_image structs and the descriptor
construction code are replaced by a single embedded OffloadBinary blob
passed directly to the register/unregister entry points.
- clang-sycl-linker generates a single OffloadBinary, which contains
multiple images.
- ProgramAndKernelManager::registerFatBin parses the blob via
OffloadBinary::create, keying MDeviceImageManagers by BinaryStart to
eliminate the reparse on unregister.
- DeviceImageManager owns std::unique_ptr<OffloadBinary> instead of
borrowing a __sycl_tgt_device_image pointer; getRawData renamed to
getOffloadBinary.
- Introduce forEachSymbol and SymbolTable serialization
(writeSymbolTable/ SymbolTableHeader/SymbolTableEntry) in Utility.h to
expose the kernel symbol table embedded in the OffloadBinary "symbols"
section for consumption by the SYCL runtime.
- device_binary_structures.hpp reduced to DeviceBinaryTripleSPIRV64.

Co-Authored-By: Claude

2026-04-27 14:43:33 -07:00