Add a new ValueRange class.

Add a new ValueRange class.

This class represents a generic abstraction over the different ways to represent a range of Values: ArrayRef<Value *>, operand_range, result_range. This class will allow for removing the many instances of explicit SmallVector<Value *, N> construction. It has the same memory cost as ArrayRef, and only suffers cost from indexing(if+elsing the different underlying representations).

This change only updates a few of the existing usages, with more to be changed in followups; e.g. 'build' API.

PiperOrigin-RevId: 284307996