Vitaly Buka 4bc3592bd2 [MachinePipeliner] Fix use-after-free coping values of the same DenseMap (#130311) ...

After #130165.

In the code: `VRMap[CurStageNum][Def] = VRMap[CurStageNum][LoopVal]`
`VRMap[CurStageNum][LoopVal]` calculates a reference before
`VRMap[CurStageNum][Def]` which may rehash the DenseMap.
Then the reference can be dead.

2025-03-07 11:09:57 -08:00

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