[GlobalISel] Support physical register inputs in nested patterns (#121239) When importing nested patterns, we create InsnMatcher for each pattern and miss them if consider only the top level InsnMatcher. Iterate PhysRegOperands instead. Change the type of PhysRegOperands from DenseMap to SmallMapVector to have stable generation. Also drop PhysRegInputs member from InsnMatcher as there are no users of it.
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