[llvm] [SLP]Initial support for copyable elements (PR #147366)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> > Have you checked for compile time regressions?
> 
> Are you able to create perf/ branches to test on llvm-compile-time-tracker or should I create a temp branch ?

Yes, check it via compile time tracker here, here are the last results https://llvm-compile-time-tracker.com/compare.php?from=381623eb11cefd3ac21a36d028ba4832643010ef&to=95d9ac6bd89913efbb3f318e6fca879adb3d1771&stat=instructions:u

https://github.com/llvm/llvm-project/pull/147366