[CodeGen][X86] Emit fshl/fshr ir intrinsics for shiftleft128/shiftright128 ms intrinsics

Now that funnel shift handling is pretty good, we can use the intrinsics directly and avoid a lot of zext/trunc issues.

https://godbolt.org/z/YqhnnM

Differential Revision: https://reviews.llvm.org/D89405