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This diff adds APFloat support for a semantic that matches the TF32 data type used by some accelerators (most notably GPUs from both NVIDIA and AMD). For more information on the TF32 data type, see https://blogs.nvidia.com/blog/2020/05/14/tensorfloat-32-precision-format/. Some intrinsics that support the TF32 data type were added in https://reviews.llvm.org/D122044. For some discussion on supporting common semantics in `APFloat`, see similar efforts for 8-bit formats at https://reviews.llvm.org/D146441, as well as https://discourse.llvm.org/t/rfc-adding-the-amd-graphcore-maybe-others-float8-formats-to-apfloat/67969. A subsequent diff will extend MLIR to use this data type. (Those changes are not part of this diff to simplify the review process.) Reviewed By: mehdi_amini Differential Revision: https://reviews.llvm.org/D151923