[X86][Costmodel] Load/store i16 Stride=3 VF=32 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/rMaYr67hz - for intels `Block RThroughput: =56.0`; for ryzens, `Block RThroughput: <=17.8`
So pick cost of `56`.
For store we have:
https://godbolt.org/z/eMsbKqnvv - for intels `Block RThroughput: <=54.0`; for ryzens, `Block RThroughput: <=15.0`
So pick cost of `54`.
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/D111018