[Feature Request] [SPIR-V] [Proposal 0011] vk::addrof(v) to obtain an OpTypePointer to a variable and deprecate [vk::ext_reference]

[Feature Request] [SPIR-V] [Proposal 0011] vk::addrof(v) to obtain an OpTypePointer to a variable and deprecate [vk::ext_reference] #2575