[RyuJit] Add VisitOperandUses

[SingleAccretion]

For an upcoming WASM stackifier change, we'll need the ability to enumerate operand uses in their proper order. This change adds the necessary function.

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[SingleAccretion]

@dotnet/jit-contrib

There is a bit of a TP diff, hopefully it'll smooth itself out through PGO (naturally this kind of change relies on inlining to clean up the added indirection in VisitOperands).

[AndyAyersMS]

There is a bit of a TP diff, hopefully it'll smooth itself out through PGO (naturally this kind of change relies on inlining to clean up the added indirection in VisitOperands).

Mostly looks a bit faster, certainly nothing to worry about.