Handle FETCH_DIM_R after FETCH_DIM_FUNC_ARG in inference

This can happen if a call is optimized, but FETCH_DIM_FUNC_ARG
cannot be converted to FETCH_DIM_R because it uses an UNUSED op2,

Handle FETCH_DIM_R after FETCH_DIM_FUNC_ARG in inference

This can happen if a call is optimized, but FETCH_DIM_FUNC_ARG
cannot be converted to FETCH_DIM_R because it uses an UNUSED op2,
which is not supported by FETCH_DIM_R.

Fixes oss-fuzz 6144185837682688.

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