[CG][RISCV]Fix shuffling of odd number of input vectors If the input contains odd number of shuffled vectors, the 2 last shuffles are shuffled with the same first vector. Need to correctly process such situation: when the first vector is requested for the first time - extract it from the source vector, when it is requested the second time - reuse previous result. The second vector should be extracted in both cases. Fixes #125269 Reviewers: topperc, preames Reviewed By: preames Pull Request: https://github.com/llvm/llvm-project/pull/125693
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