[clang][SYCL] Emit "sycl-module-id" function attribute (#195965) Attach the "sycl-module-id" LLVM function attribute to SYCL device functions that are candidates for entry points in device-code splitting. The attribute value is the module identifier (translation unit name), which clang-sycl-linker uses to group kernels by translation unit when splitting device code. The attribute is emitted at two sites: 1. SYCL kernel caller functions (spir_kernel) are synthesized by EmitSYCLKernelCaller and do not go through EmitFunction, so the attribute is set directly after SetSYCLKernelAttributes. 2. sycl_external function definitions go through SetLLVMFunctionAttributesForDefinition; the attribute is added there when SYCLIsDevice and SYCLExternalAttr are present. Both sites call the new CodeGenModule::addSYCLModuleIdAttr helper. Co-authored-by: Claude
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