[llvm] [SLP][NFC] Remove useless code of deleting ExtractElementInst (PR #106697)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

You mean as an operand with a single use? Yes, missed this when added removeInstructionsAndOperands. But there is another point behind this code. It allows to sync the cost and the codegen. It allows better track what extractelements can be removed after vectorization and if it is safe to remove their cost out of the vector code cost. There are 2 adjustExtracts - one for cost and one for vectorization. This code allows more carefully track the cost of the removed extractelements.

https://github.com/llvm/llvm-project/pull/106697