[llvm] [mlir] [SPIR-V] Add support for the SPIR-V extension SPV_INTEL_tensor_float32_conversion (PR #150090)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar commented:

Can we land mlir support separately from the llvm backend? This should make it easier to review and potentially revert in the future.

https://github.com/llvm/llvm-project/pull/150090