[SPIR-V] Introduce support of llvm.ptr.annotation to SPIR-V Backend and...

[SPIR-V] Introduce support of llvm.ptr.annotation to SPIR-V Backend and implement extensions which make use of spirv.Decorations (#93561)

This PR introduces support of llvm.ptr.annotation to SPIR-V Backend, and
implement several extensions which make use of spirv.Decorations and
llvm.ptr.annotation to annotate global variables and pointers:

- SPV_INTEL_cache_controls
- SPV_INTEL_global_variable_host_access
- SPV_INTEL_global_variable_fpga_decorations