[X86][Costmodel] Load/store i64/f64 Stride=3 VF=8 interleaving costs

[X86][Costmodel] Load/store i64/f64 Stride=3 VF=8 interleaving costs

This one required quite a bit of assembly surgery.

The only sched models that for cpu's that support avx2
but not avx512 are: haswell, broadwell, skylake, zen1-3

For load we have:
https://godbolt.org/z/oYWv4cTnK - for intels `Block RThroughput: =10.0`; for ryzens, `Block RThroughput: <=8.0`
So pick cost of `10`.

For store we have:
https://godbolt.org/z/33GMhrsG9 - for intels `Block RThroughput: =12.0`; for ryzens, `Block RThroughput: <=8.0`
So pick cost of `12`.

I'm directly using the shuffling asm the llc produced,
without any manual fixups that may be needed
to ensure sequential execution.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D111027