[clang][CodeGen][SPIRV] Translate `amdgpu_flat_work_group_size` into `max_work_group_size`. (#116820) HIPAMD relies on the `amdgpu_flat_work_group_size` attribute to implement key functionality such as the `__launch_bounds__` `__global__` function annotation. This attribute is not available / directly translatable to SPIR-V, hence as it is AMDGCN flavoured SPIR-V suffers from information loss. This patch addresses that limitation by converting the unsupported attribute into the `max_work_group_size` attribute which maps to [`MaxWorkgroupSizeINTEL`](https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/INTEL/SPV_INTEL_kernel_attributes.asciidoc), which is available in / handled by SPIR-V. When reverse translating from SPIR-V to AMDGCN LLVMIR we invert the map and add the original AMDGPU attribute.
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