[LV] Add option to tune the cost model, NFC

For Neon, the default nonconst stride cost is conservative,
and it is a local variable, which is not convenience to
to tune the loop vectorize.
So I try to use a option, which is similar to SVEGatherOverhead brought in D115143.
Fix https://github.com/llvm/llvm-project/issues/63082.

Reviewed By: dmgreen, fhahn
Differential Revision: https://reviews.llvm.org/D152253