[llvm] [SelectionDAG] Deal with POISON for INSERT_VECTOR_ELT/INSERT_SUBVECTOR (PR #143102)

[Björn Pettersson via llvm-commits]

bjope wrote:

> What happened to the plan to to add ISD::INSERT_SUBVECTOR to the multiple operand list in visitFREEZE? With that in place much of this logic can be simplified and we just FREEZE instead of calling isGuaranteedNotToBePoison explicitly so much

That change is included here: https://github.com/llvm/llvm-project/pull/143102/files#diff-d0eb75096db76ab253fc7f8ae6343c4b4516fc619d851898cbdac1a5bf481941

https://github.com/llvm/llvm-project/pull/143102