[TableGen][GISel] Fix importing frameindex node (#120921) The existing test case is not representative. Even though TableGen doesn't complain, the code generated from it is invalid and fails verification with the message "Use not jointly dominated by defs.". There is no way to magically transform `frameindex` to `tframeindex` as it happens for some other leaf nodes. `frameindex` can only be selected by custom C++ code or by using an `SDNodeXForm`. This patch makes the test representative one and fixes the handling of `G_FRAME_INDEX`, which shouldn't have set the operand's name. It also fixes the type of the result of `G_FRAME_INDEX` in order to get the correct type check (`GIM_CheckPointerToAny` instead of `GIM_CheckType` with a scalar LLT argument).
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