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This diff adds support for TF32 as a Builtin floating point type. This supplements the recent addition of the TF32 semantic to the LLVM APFloat class by extending usage to MLIR. https://reviews.llvm.org/D151923 More information on the TF32 type can be found here: https://blogs.nvidia.com/blog/2020/05/14/tensorfloat-32-precision-format/ Reviewed By: jpienaar Differential Revision: https://reviews.llvm.org/D153705