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If `li.s` or `li.d` loads zero into a FPR, it's not necessary to load zero into `at` GPR register and then move its value into a floating point register. We can use as a source register the `zero / $0` one. Differential Revision: https://reviews.llvm.org/D68777 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374597 91177308-0d34-0410-b5e6-96231b3b80d8