[Intrinsics] Fix `nvvm_prmt` intrinsic attributes

`nvvm_prmt` doesn't seem to be `commutative`. nvvm also sets `IntrSpeculatable` for it.
Here is the doc https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#data-movement-and-conversion-instructions-prmt

Reviewed By: tra, jchlanda

Differential Revision: https://reviews.llvm.org/D125423