[X86][Costmodel] Load/store i32/f32 Stride=4 VF=8 interleaving costs

[X86][Costmodel] Load/store i32/f32 Stride=4 VF=8 interleaving costs

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/a6rxMG6ec - for intels `Block RThroughput: =16.0`; for ryzens, `Block RThroughput: <=12.0`
So could pick cost of `16`.

For store we have:
https://godbolt.org/z/ced1bdqc9 - for intels `Block RThroughput: =16.0`; for ryzens, `Block RThroughput: <=8.0`
So we could pick cost of `16`.

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/D111063