David Green 57356d6bb7 [DAG] Create fptoui.sat from clamped fptoui
This is the unsigned variant of D111976, where we convert a clamped
fptoui to a fptoui.sat. Because we are unsigned, the condition this time
is only UMIN of UINT_MAX. Similarly to D111976 it handles ISD::UMIN,
ISD::SETCC/ISD::SELECT, ISD::VSELECT or ISD::SELECT_CC nodes.

This especially helps on ARM/AArch64 where the vcvt instructions
naturally saturate the result.

Differential Revision: https://reviews.llvm.org/D114964
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