[clang][SPIRV] Add builtin for OpGenericCastToPtrExplicit and its SPIR-V friendly binding (#137805) The patch introduce __builtin_spirv_generic_cast_to_ptr_explicit which is lowered to the llvm.spv.generic.cast.to.ptr.explicit intrinsic. The SPIR-V builtins are now split into 3 differents file: BuiltinsSPIRVCore.td, BuiltinsSPIRVVK.td for Vulkan specific builtins, BuiltinsSPIRVCL.td for OpenCL specific builtins and BuiltinsSPIRVCommon.td for common ones. The patch also introduces a new header defining its SPIR-V friendly equivalent (__spirv_GenericCastToPtrExplicit_ToGlobal, __spirv_GenericCastToPtrExplicit_ToLocal and __spirv_GenericCastToPtrExplicit_ToPrivate). The functions are declared as aliases to the new builtin allowing C-like languages to have a definition to rely on as well as gaining proper front-end diagnostics. The motivation for the header is to provide a stable binding for applications or library (such as SYCL) and allows non SPIR-V targets to provide an implementation (via libclc or similar to how it is done for gpuintrin.h).
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