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

[Dmitry Sidorov via llvm-commits]

https://github.com/MrSidims approved this pull request.

SPIR-V backend part of the PR is LGTM.

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