[TableGen] Capture bound source ops in PatternState

[TableGen] Capture bound source ops in PatternState

    This allows accessing those bound source ops in result patterns, which can be
    useful for invoking native C++ op creation.

    We bind the op entirely here because ops can have multiple results. Design a
    approach to bind to a specific result is not the concern of this commit.

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PiperOrigin-RevId: 244724750