Fangrui Song 6f3e6a765a Revert D129735 "[RISCV] Add new pass to transform undef to pseudo for vector values." ...

This reverts commit f1c4241fb6.

It causes use-after-poison asan failures for
CodeGen/RISCV/rvv/undef-earlyclobber-chain.ll and CodeGen/RISCV/regalloc-last-chance-recoloring-failure.ll

2023-02-15 11:51:08 -08:00

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