[MLIR][NVVM] Add nvvm.fma Op (#184776)
Adds `nvvm.fma` Op to the NVVM dialect to perform fused multiply-add
operations.
PTX ISA Reference:
1.
https://docs.nvidia.com/cuda/parallel-thread-execution/#floating-point-instructions-fma
2.
https://docs.nvidia.com/cuda/parallel-thread-execution/#half-precision-floating-point-instructions-fma
